{"title":"Fysikmuggar","description":"\u003cp\u003eFysikens lagar, ritade som pixelkonstfigurer, på svarta keramikmuggar i 11 och 15 oz. Varje mugg kombinerar en figur med dess ekvation och ett skämt på en rad, från Plancks strålningslag till Higgsmekanismen. Varje produktsida har en fysikpanel som förklarar symbolerna och anger källor att kontrollera.\u003c\/p\u003e","products":[{"product_id":"radiatrix-blackbody-radiation-physics-mug","title":"Radiatrix – Blackbody Radiation Physics Mug","description":"\u003cp\u003eWhy does a heated poker go from red to white? Radiatrix glows by Planck’s law. Heat a blackbody and it emits more at every wavelength, while its peak slides toward shorter wavelengths, as Wien’s law says. Hot stars look blue-white; cool ones look red. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420026409063,"sku":"16528245381636617003","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420026441831,"sku":"22092932615463099546","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/radiatrix_closeup_2400.png?v=1791690129"},{"product_id":"fuzzwick-uncertainty-principle-physics-mug","title":"Fuzzwick – Uncertainty Principle Physics Mug","description":"\u003cp\u003eCan you pin down where a particle is and how fast it moves at once? Fuzzwick says no. Heisenberg’s uncertainty principle, σxσp ≥ ħ\/2, is a property of quantum states, not of clumsy instruments: squeeze the spread in position and the spread in momentum must grow. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420026802279,"sku":"14360070256122505682","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420026835047,"sku":"11976528833919372768","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/fuzzwick_closeup_2400.png?v=1791690132"},{"product_id":"disordra-entropy-physics-mug","title":"Disordra – Entropy Physics Mug","description":"\u003cp\u003eWhy does coffee cool but never reheat itself? Disordra counts the ways. Boltzmann’s S = kB ln Ω links entropy to the number of microscopic arrangements behind what we see. Disordered states vastly outnumber ordered ones, so an isolated system’s total entropy almost never decreases. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420027031655,"sku":"22785479011697180977","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420027064423,"sku":"51384677882371788442","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/disordra_closeup_2400.png?v=1791690135"},{"product_id":"maxwellion-maxwell-s-equations-physics-mug","title":"Maxwellion – Maxwell’s Equations Physics Mug","description":"\u003cp\u003eWhat is light, really? Maxwellion holds the answer in four lines. Maxwell’s equations tie electric and magnetic fields to charges, currents and each other. In empty space they predict waves travelling at c = 1\/√(μ0ε0), the speed of light, so light is an electromagnetic wave. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420027359335,"sku":"31740406656164837428","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420027392103,"sku":"32451337526852530803","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/maxwellion_closeup_2400.png?v=1791690137"},{"product_id":"dilatia-time-dilation-physics-mug","title":"Dilatia – Time Dilation Physics Mug","description":"\u003cp\u003eWhose clock is right? Both. Dilatia shows special relativity’s time dilation: a clock moving relative to you ticks slower by the Lorentz factor γ, so Δt = γΔt0. The effect is symmetric between moving observers, and it is measured daily in fast muons and GPS satellites. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420027555943,"sku":"12857651055471049499","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420027588711,"sku":"10766718920131961829","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/dilatia_closeup_2400.png?v=1791690141"},{"product_id":"psykat-schrodinger-equation-physics-mug","title":"Psykat – Schrödinger Equation Physics Mug","description":"\u003cp\u003eWhat does a quantum system do when nobody looks? Psykat evolves smoothly. The Schrödinger equation, iħ∂Ψ\/∂t = ĤΨ, fixes how the wavefunction changes in time, set by the system’s energy. A measurement yields one outcome, with probabilities given by the Born rule, |Ψ|². Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420027752551,"sku":"20141770002868938098","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420027785319,"sku":"29823068111006630670","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/psykat_closeup_2400.png?v=1791690147"},{"product_id":"exclusor-pauli-exclusion-physics-mug","title":"Exclusor – Pauli Exclusion Physics Mug","description":"\u003cp\u003eWhy don’t atoms collapse into one blob? Exclusor guards the door. Identical fermions such as electrons have an antisymmetric wavefunction, ψ(x1,x2) = −ψ(x2,x1), so no two can share the same quantum state. Electrons fill shells in order, giving chemistry its periodic table. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420027949159,"sku":"32967370328880074670","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420027981927,"sku":"31033930273669909149","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/exclusor_closeup_2400.png?v=1791690149"},{"product_id":"wakewing-kelvin-wake-physics-mug","title":"Wakewing – Kelvin Wake Physics Mug","description":"\u003cp\u003eWhy do a duck and a ship leave the same V? Wakewing rides deep water. The dispersion of gravity waves fixes a Kelvin wake half-angle of arcsin(1\/3), about 19.47°, independent of speed. Lord Kelvin derived it in 1887. Very fast hulls can show narrower apparent wakes. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420028145767,"sku":"12414383073299510484","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420028178535,"sku":"26725157293683615381","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/wakewing_closeup_2400.png?v=1791690152"},{"product_id":"inertio-newton-s-second-law-physics-mug","title":"Inertio – Newton’s Second Law Physics Mug","description":"\u003cp\u003eWhy is a full shopping cart harder to start than an empty one? Inertio stands firm. Newton’s second law, F = ma, says the net force on a body equals its mass times its acceleration. Double the mass and you need double the force for the same change in motion. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420028342375,"sku":"26491420472196871122","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420028375143,"sku":"32361277589292247061","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/inertio_closeup_2400.png?v=1791690156"},{"product_id":"springald-hooke-s-law-physics-mug","title":"Springald – Hooke’s Law Physics Mug","description":"\u003cp\u003eWhy does a spring return home? Springald stretches and snaps back. Hooke’s law, F = −kx, says the restoring force grows in proportion to the displacement and points the other way. It holds within the elastic limit; stretch too far and the spring deforms permanently. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420028670055,"sku":"57000550417693298723","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420028702823,"sku":"68957409090116504344","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/springald_closeup_2400.png?v=1791690159"},{"product_id":"bernoulla-bernoulli-s-principle-physics-mug","title":"Bernoulla – Bernoulli’s Principle Physics Mug","description":"\u003cp\u003eWhy does a shower curtain drift inward? Bernoulla follows the flow. Along a streamline in steady, incompressible, frictionless flow, P + ½ρv² + ρgh stays constant, so where the fluid speeds up its pressure drops. It underlies Venturi meters and pitot tubes. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420028899431,"sku":"12940512753769465934","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420028932199,"sku":"24222749088221590693","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/bernoulla_closeup_2400.png?v=1791690164"},{"product_id":"dopplerine-doppler-effect-physics-mug","title":"Dopplerine – Doppler Effect Physics Mug","description":"\u003cp\u003eWhy does a siren drop in pitch as it passes? Dopplerine rides the waves. A source moving toward you bunches its wavefronts, so you hear a higher frequency; moving away, they spread and the pitch falls. For sound, f = f0(v + vo)\/(v − vs), with vo and vs positive when observer and source move toward each other. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420029063271,"sku":"29904204328919128398","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420029096039,"sku":"60886425723260755440","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/dopplerine_closeup_2400.png?v=1791690168"},{"product_id":"coulombo-coulomb-s-law-physics-mug","title":"Coulombo – Coulomb’s Law Physics Mug","description":"\u003cp\u003eWhy do opposite charges cling together? Coulombo feels the pull. Coulomb’s law, F = keq1q2\/r², says the electric force between two point charges grows with their product and falls with the square of the distance. Like charges repel; opposites attract. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420029292647,"sku":"14237097683614976403","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420029325415,"sku":"98144113429695375441","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/coulombo_closeup_2400.png?v=1791690170"},{"product_id":"keplora-kepler-s-third-law-physics-mug","title":"Keplora – Kepler’s Third Law Physics Mug","description":"\u003cp\u003eWhy is a year on Neptune 165 Earth years? Keplora counts the laps. Kepler’s third law, T² = (4π²\/GM)a³, ties a planet’s orbital period to its average distance from the Sun. Farther out, the orbit is longer and the planet moves slower. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420029423719,"sku":"29709986523455150405","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420029456487,"sku":"82068193699797810328","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/keplora_closeup_2400.png?v=1791690174"},{"product_id":"photonix-photoelectric-effect-physics-mug","title":"Photonix – Photoelectric Effect Physics Mug","description":"\u003cp\u003eWhy can dim ultraviolet light free electrons when bright red light cannot? Photonix knows. Light arrives in quanta of energy hf. Each photon frees one electron with at most Kmax = hf − φ, so frequency sets the energy and brightness only sets the number. Einstein explained it in 1905. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420029554791,"sku":"16271002978429589791","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420029587559,"sku":"73622996334936763073","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/photonix_closeup_2400.png?v=1791690176"},{"product_id":"debroglio-matter-waves-physics-mug","title":"Debroglio – Matter Waves Physics Mug","description":"\u003cp\u003eCan a baseball be a wave? Debroglio says yes, technically. Louis de Broglie proposed in 1924 that every particle with momentum p has a wavelength λ = h\/p. Electrons diffract through crystals, as Davisson and Germer saw, but a baseball’s wavelength is far too tiny to notice. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420029751399,"sku":"12421817188338575434","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420029784167,"sku":"16619743571999789270","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/debroglio_closeup_2400.png?v=1791690179"},{"product_id":"ghostwall-quantum-tunnelling-physics-mug","title":"Ghostwall – Quantum Tunnelling Physics Mug","description":"\u003cp\u003eCan a particle pass through a wall it cannot climb? Ghostwall can, sometimes. In quantum mechanics a particle’s wavefunction leaks into a barrier, so it has a small chance of appearing beyond it, roughly T ≈ e^(−2κL). Tunnelling powers alpha decay, the Sun’s fusion and scanning tunnelling microscopes. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420029948007,"sku":"13600626574140867531","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420029980775,"sku":"21129091235291135480","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/ghostwall_closeup_2400.png?v=1791690250"},{"product_id":"qubitta-quantum-superposition-physics-mug","title":"Qubitta – Quantum Superposition Physics Mug","description":"\u003cp\u003eIs it 0 or 1? Qubitta holds both amplitudes at once. A qubit’s state, α|0⟩ + β|1⟩, is a superposition, not a hidden choice. Measure it and you get 0 with probability |α|² or 1 with probability |β|², and the superposition is gone. Quantum computers run on this. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420030177383,"sku":"29118024886547694008","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420030210151,"sku":"60449636659873719696","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/qubitta_closeup_2400.png?v=1791690253"},{"product_id":"higgsby-higgs-mechanism-physics-mug","title":"Higgsby – Higgs Mechanism Physics Mug","description":"\u003cp\u003eWhere does mass come from? Higgsby fills space with the Higgs field. Electrons, quarks and W and Z bosons get their masses by coupling to it, mf = yfv\/√2. Yet quarks supply only about 1% of a proton’s mass; the rest, and most of yours, is QCD binding energy. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420030373991,"sku":"11385391381233428227","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420030406759,"sku":"19137924314600623316","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/higgsby_closeup_2400.png?v=1791690256"},{"product_id":"umbrar-dark-matter-physics-mug","title":"Umbrar – Dark Matter Physics Mug","description":"\u003cp\u003eWhy don’t spinning galaxies fly apart? Umbrar is the unseen answer. For a circular orbit, v(r) = √(GM(r)\/r), so speeds should fall far from the centre. Vera Rubin and others measured flat rotation curves instead, implying extra mass we cannot see: dark matter. What it is remains unknown. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420030570599,"sku":"21003532258102893946","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420030603367,"sku":"11008545922732168379","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/umbrar_closeup_2400.png?v=1791690259"},{"product_id":"hawkara-hawking-radiation-physics-mug","title":"Hawkara – Hawking Radiation Physics Mug","description":"\u003cp\u003eCan a black hole shine? Hawkara thinks so. In 1974 Stephen Hawking predicted that quantum effects make black holes glow with temperature TH = ħc³\/(8πGMkB). Smaller holes are hotter and slowly evaporate. For star-sized black holes it is far too faint to see, so it remains unobserved. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420030767207,"sku":"27598385898882451406","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420030799975,"sku":"29043198863780347415","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/hawkara_closeup_2400.png?v=1791690261"},{"product_id":"refracta-snell-s-law-physics-mug","title":"Refracta – Snell’s Law Physics Mug","description":"\u003cp\u003eWhy does a straw look broken in a glass of water? Refracta bends the light. Light travels at different speeds in different materials, so it changes direction at a boundary. Snell’s law, n1 sin θ1 = n2 sin θ2, gives the new angle. Lenses, prisms and rainbows all depend on it. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420030963815,"sku":"45656487674578143112","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420030996583,"sku":"28926723157428102542","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/refracta_closeup_2400.png?v=1791690265"},{"product_id":"ohmbert-ohm-s-law-physics-mug","title":"Ohmbert – Ohm’s Law Physics Mug","description":"\u003cp\u003eWhy does a thin wire get hot? Ohmbert resists. Ohm’s law, V = IR, says the current through a conductor is proportional to the voltage across it, with resistance setting the ratio. More resistance means less current for the same voltage, and energy lost as heat. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420031193191,"sku":"23233805917920003533","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420031225959,"sku":"97554548670288018928","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/ohmbert_closeup_2400.png?v=1791690268"},{"product_id":"faradax-faraday-s-law-physics-mug","title":"Faradax – Faraday’s Law Physics Mug","description":"\u003cp\u003eHow does a generator make electricity? Faradax answers change with change. Faraday’s law says a changing magnetic flux through a loop induces a voltage, E = −dΦB\/dt. The minus sign is Lenz’s law: the induced current opposes the change. Generators, transformers and induction hobs all rely on it. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420031389799,"sku":"11608435883195632095","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420031422567,"sku":"32884286247479053160","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/faradax_closeup_2400.png?v=1791690271"},{"product_id":"boylina-boyle-s-law-physics-mug","title":"Boylina – Boyle’s Law Physics Mug","description":"\u003cp\u003eWhy does a squeezed balloon push back harder? Boylina feels the pressure. Boyle’s law, P1V1 = P2V2, says that for a fixed amount of gas at constant temperature, halving the volume doubles the pressure. Robert Boyle published it in 1662, and divers still plan around it. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420031684711,"sku":"21900132125948264871","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420031717479,"sku":"29575368022955950313","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/boylina_closeup_2400.png?v=1791690274"},{"product_id":"buoyara-archimedes-principle-physics-mug","title":"Buoyara – Archimedes’ Principle Physics Mug","description":"\u003cp\u003eWhy does a steel ship float? Buoyara knows. Archimedes’ principle says any body in a fluid feels an upward buoyant force equal to the weight of fluid it displaces, Fb = ρfluid V g. If that beats the body’s weight, as for a hollow hull or a helium balloon, it rises. 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Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420032208999,"sku":"88538824990946342023","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420032241767,"sku":"12719982683403640432","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/entangla_closeup_2400.png?v=1791690279"},{"product_id":"pendulo-simple-pendulum-physics-mug","title":"Pendulo – Simple Pendulum Physics Mug","description":"\u003cp\u003eWhy do grandfather clocks have long pendulums? Pendulo keeps time. For small swings, a simple pendulum’s period is T = 2π√(L\/g): it depends on length and gravity, not on the bob’s mass. A one-metre pendulum takes about two seconds per full swing. Galileo first noticed the timing. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50420032405607,"sku":"81375274707979359815","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50420032438375,"sku":"20876142841175806665","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/pendulo_closeup_2400.png?v=1791690283"},{"product_id":"the-condensate-queen-bose-einstein-condensate-physics-mug","title":"The Condensate Queen – Bose-Einstein Condensate Physics Mug","description":"\u003cp\u003eMeet The Condensate Queen. Cool atoms until their quantum waves overlap and thousands act as one. First done in a gas in 1995, at about 170 billionths of a degree above absolute zero. On the mug: nλ_dB³ ≈ 2.612, the onset of condensation in an ideal gas. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913981759591,"sku":"18460000060309362844","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913981792359,"sku":"64893399571442593772","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/10859152430022653285_2048.jpg?v=1793572756"},{"product_id":"the-limit-keeper-chandrasekhar-limit-physics-mug","title":"The Limit Keeper – Chandrasekhar Limit Physics Mug","description":"\u003cp\u003eMeet The Limit Keeper. In a white dwarf, electrons refuse to share states and push back. Above about 1.4 Suns, even that pressure loses to gravity. On the mug: M_Ch ≈ 5.8 M☉\/μ_e² ≈ 1.4 M☉. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913981857895,"sku":"27721459015550517022","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913981890663,"sku":"15355895856017465291","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/18248042587707472190_2048.jpg?v=1793572774"},{"product_id":"the-accelerant-unruh-effect-physics-mug","title":"The Accelerant – Unruh Effect Physics Mug","description":"\u003cp\u003eMeet The Accelerant. Accelerate through empty space and it looks like a warm bath, but only to you. You'd need 10²⁰ m\/s² to feel 0.4 K. Predicted, not yet seen directly. On the mug: T = ħa\/(2πck_B). Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913981956199,"sku":"30476453600576299414","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913981988967,"sku":"15411805540098261337","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/10665672710439144534_2048.jpg?v=1793572789"},{"product_id":"zeno-quantum-zeno-effect-physics-mug","title":"Zeno – Quantum Zeno Effect Physics Mug","description":"\u003cp\u003eMeet Zeno. A quantum state starts to change slowly, as the square of time. Measure it again and again and each check resets the clock. In 1990, ion-trap physicists showed it: more measurements, fewer jumps. On the mug: P_stay(t) ≈ 1 − (t\/τ_Z)². Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982054503,"sku":"22349151499416461244","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982087271,"sku":"88963170575289306039","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/9897082586086054849_2048.jpg?v=1793572807"},{"product_id":"graviton-whisper-quantum-gravity-physics-mug","title":"Graviton Whisper – Quantum Gravity Physics Mug","description":"\u003cp\u003eMeet Graviton Whisper. LIGO hears gravitational waves. If gravity is quantum, those waves are made of gravitons: massless, spin 2. No one has ever detected one, and catching a single graviton may be impossible in practice. On the mug: E = hf, m_g = 0, s = 2. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982152807,"sku":"28441449962862545988","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982185575,"sku":"21971507666056949564","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/14555825873122288346_2048.jpg?v=1793572826"},{"product_id":"null-beacon-cosmic-event-horizon-physics-mug","title":"Null Beacon – Cosmic Event Horizon Physics Mug","description":"\u003cp\u003eMeet Null Beacon. Because expansion is speeding up, there is a distance beyond which light sent today never reaches us. Galaxies we now see at redshift about 1.9 are at that distance today. We still see their old light; their new light is lost. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982251111,"sku":"96581520985483423964","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982283879,"sku":"13170902174690299459","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/5560970392446449392_2048.jpg?v=1793572841"},{"product_id":"neutrina-fade-neutrino-oscillation-physics-mug","title":"Neutrina Fade – Neutrino Oscillation Physics Mug","description":"\u003cp\u003eMeet Neutrina Fade. About 65 billion solar neutrinos cross each square centimetre of you every second. They change flavour as they travel, which is only possible if they have mass. On the mug: the two-flavour oscillation formula P ≈ sin²(2θ) sin²(1.27 Δm² L\/E). Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982349415,"sku":"26543651614528476845","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982382183,"sku":"70094182538778225037","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/12009555080355416004_2048.jpg?v=1793572856"},{"product_id":"eventide-prophet-black-hole-information-paradox-physics-mug","title":"Eventide Prophet – Black Hole Information Paradox Physics Mug","description":"\u003cp\u003eMeet Eventide Prophet. Black holes glow and slowly evaporate. If the glow is purely thermal, what fell in is erased, which quantum mechanics forbids. Recent work suggests the information gets out. How, exactly, is still open. On the mug: T_H = ħc³\/(8πGMk_B). Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982447719,"sku":"82896617287901506430","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982480487,"sku":"67264836390958828466","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/8160977516360359257_2048.jpg?v=1793572877"},{"product_id":"dark-matter-host-gravitational-lensing-physics-mug","title":"Dark Matter Host – Gravitational Lensing Physics Mug","description":"\u003cp\u003eMeet Dark Matter Host. When two galaxy clusters collided in the Bullet Cluster, their hot gas slammed together and stalled, but bent background light shows most of the mass sailed on with the galaxies. About five-sixths of all matter is something never directly detected. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982546023,"sku":"13281410563689372133","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982578791,"sku":"25551953155385116559","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/2063512069901227910_2048.jpg?v=1793572892"},{"product_id":"plasma-drift-e-b-drift-physics-mug","title":"Plasma Drift – E × B Drift Physics Mug","description":"\u003cp\u003eMeet Plasma Drift. Heat a gas until its atoms come apart and it becomes plasma. In crossed electric and magnetic fields, electrons and ions circle opposite ways, yet both drift the same direction at the same speed. On the mug: v_E = E × B \/ B². Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982644327,"sku":"28545110236916304879","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982677095,"sku":"34001644913549350870","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/18406445875286704537_2048.jpg?v=1793572909"},{"product_id":"thermal-mirage-heat-refraction-physics-mug","title":"Thermal Mirage – Heat Refraction Physics Mug","description":"\u003cp\u003eMeet Thermal Mirage. Hot air over a road is thinner, so light travels slightly faster in it. Skylight skimming the road bends up into your eye, and you see the sky below the horizon: the puddle is sky. On the mug: n cos α = constant. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982742631,"sku":"58194718779195712041","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982775399,"sku":"16144256497069355181","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/9786529975521584234_2048.jpg?v=1793572927"},{"product_id":"superfluid-quantised-vortices-physics-mug","title":"Superfluid – Quantised Vortices Physics Mug","description":"\u003cp\u003eMeet Superfluid. Below 2.17 K, part of liquid helium flows with no viscosity at all. Spin it and it forms a lattice of tiny whirlpools, each carrying exactly one quantum of circulation. On the mug: ∮ v_s · dℓ = nh\/m₄. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982840935,"sku":"21936772338988384071","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982873703,"sku":"25439549564432919898","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/3582833572456784925_2048.jpg?v=1793572942"},{"product_id":"cryo-fault-ductile-to-brittle-transition-physics-mug","title":"Cryo Fault – Ductile-to-Brittle Transition Physics Mug","description":"\u003cp\u003eMeet Cryo Fault. Some steels bend when warm but snap in hard cold: below a transition temperature their crystals crack before they can flow. Some wartime Liberty ships broke in two this way. On the mug: K_I = Yσ√(πa) ≥ K_Ic ⇒ fracture. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913982939239,"sku":"57911363199510912785","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913982972007,"sku":"13270622418211133022","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/8326246554373843185_2048.jpg?v=1793572958"},{"product_id":"spaghetta-spaghettification-physics-mug","title":"Spaghetta – Spaghettification Physics Mug","description":"\u003cp\u003eMeet Spaghetta. Gravity pulls your feet harder than your head. Near a small black hole that difference tears you apart before you reach the horizon; at the giant one in our galaxy's centre you would cross without feeling it. On the mug: Δa ≈ 2GML\/r³. Pixel-art full-wrap black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"11oz","offer_id":50913983037543,"sku":"13700537266575408599","price":21.99,"currency_code":"USD","in_stock":true},{"title":"15oz","offer_id":50913983070311,"sku":"11136910078628520970","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/15455435289262813799_2048.jpg?v=1793572973"},{"product_id":"void-whisperer-cosmological-constant-physics-mug","title":"Void Whisperer – Cosmological Constant Physics Mug","description":"\u003cp\u003eMeet Void Whisperer. The universe's expansion is speeding up, as if empty space had energy. Adding up quantum zero-point energy naively gives a number up to about 10¹²⁰ times too large. The fix is unknown. On the mug: ρ_Λ ≈ (2.2 meV)⁴, in units where ħ = c = 1. 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