• Pixel-art Creamward, the Milk-First Alchemist, on a black mug with the slogan "ADD THE MILK FIRST. NEWTON AGREES."

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Creamward, the Milk-First Alchemist Mug

\[\frac{dT}{dt} = -k\,(T - T_{\text{env}})\]
$21.99 USD
$21.99 USD
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Newton's law of cooling: loss rate ∝ (T − Tenv). With fridge-cold milk, adding it first lets the cold deficit relax toward room temperature too, so milk-first is hotter at drinking time; nonlinear radiative and evaporative losses (largest when hottest) push the same way.

The joke: Cooling rate depends on ΔT, so milk timing matters. The slogan on the mug reads ADD THE MILK FIRST. NEWTON AGREES.

Source: [I. Newton] (published anonymously), "Scala graduum caloris", Phil. Trans. 22, 824 (1701).

Shipping calculated at checkout by destinationMade to order, ships in ~10 days

Details

Size & material11oz · 15oz

Black glossy ceramic mug with a C-handle. Lead- and BPA-free.

  • 11oz: 0.33 l
  • 15oz: 0.44 l
CareDishwasher & microwave safe

Dishwasher safe (top rack) or hand wash. Microwave safe.

ShippingBy destination

Shipping calculated at checkout by destination.

Made to order: about 10 days of production and handling before it ships.

Delivery times & where we ship

Returns & replacements21 days

Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.

Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.

Full refund & replacement policy

The physics

Newton's law of cooling: loss rate ∝ (T − T_env). With fridge-cold milk, adding it first lets the cold deficit relax toward room temperature too, so milk-first is hotter at drinking time; nonlinear radiative and evaporative losses (largest when hottest) push the same way.

The joke: Cooling rate depends on ΔT, so milk timing matters. The slogan on the mug reads ADD THE MILK FIRST. NEWTON AGREES.

Source: [I. Newton] (published anonymously), "Scala graduum caloris", Phil. Trans. 22, 824 (1701).

Equations

\[\frac{dT}{dt} = -k\,(T - T_{\text{env}})\]
SymbolMeaningUnit
\(T\) coffee temperature \(\mathrm{K}\)
\(T_{env}\) room temperature \(\mathrm{K}\)
\(k\) cooling constant \(\mathrm{s^{-1}}\)
\(t\) time \(\mathrm{s}\)

Sources

  1. [I. Newton] (published anonymously), "Scala graduum caloris", Phil. Trans. 22, 824 (1701)

Field notes

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