Skip to main content

What is entropy? - Jeff Phillips

4,344,837 Views

9,459 Questions Answered

TEDEd Animation

Let’s Begin…

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.

Besides the examples provided (hot object in contact with a cold one, air leaking out of a tire, cream mixing into coffee), what are other examples that illustrate the nature of entropy as time’s arrow? Hint: Think about what a process would look like or behave if time were reversed… “run the movie backwards.” These reversed processes should look “odd” or unphysical.

Login to answer question

About TED-Ed Animations

TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

  • Educator Jeff Phillips
  • Director Iuri Araujo, Guilherme Araujo
  • Script Editor Eleanor Nelsen
  • Animator Iuri Araujo, Guilherme Araujo
  • Compositor Andre Luiz Machado
  • Composer Andre Luiz Machado
  • Associate Producer Jessica Ruby
  • Content Producer Gerta Xhelo
  • Editorial Producer Alex Rosenthal
  • Narrator Addison Anderson

More from Before and After Einstein