Thermodynamics

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Heat, work and entropy. The second law says it only goes one way.

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About this collection

Heat, temperature and the states of matter. From the second law of thermodynamics (the entropy of an isolated system never decreases) and the heat death it implies, down to absolute zero and superfluid helium, and up through combustion, plasma, heat mirages and the cold that makes metals brittle.

Unisex pixel-art physics tees and hoodies (sizes S–5XL), plus stickers and sticker sheets.

Each thermodynamics design here is built on a real law or effect, with the equation and sources on its product page, from Boltzmann's entropy formula to the physics of superfluids.