Illustrated Physics
physics, drawn
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Order out of the random

Enormous numbers of unpredictable particles producing quantities you can print on a dial.
0123456700.20.40.60.8speedT = 0.5T = 1T = 2T = 4no molecule has the average speed; most are near it Thermodynamics

The speeds in a still room

The air in a quiet room is not still. Every molecule in it is moving at hundreds of metres per second, and temperature is a single number summarising an entire distribution.

 1010145212032104252521061207458109110number of heads1,024 arrangements in total, all equally likelythe middle has 252 of them Thermodynamics

Entropy is a count, and the arrow of time is arithmetic

Nothing in mechanics prefers a direction. Entropy is not a force pushing things toward disorder — it is the observation that some outcomes have vastly more ways of happening than others.

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