Why does ice melt? Why does cream spread in coffee?

There’s a concept that’s crucial to chemistry and physics. It helps explain why physical processes go one way and not the other: why ice melts, why cream spreads in coffee, why air leaks out of a punctured tire. It’s entropy, and it’s notoriously difficult to wrap our heads around. Jeff Phillips gives a crash course on entropy.
Lesson by Jeff Phillips, animation by Provincia Studio.

[Via: ed.ted.com]

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