View full lesson: http://ed.ted.com/lessons/what-is-ent...\n\nThere’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. \n\nLesson by Jeff Phillips, animation by Provincia Studio.