Key question
Why does time have an arrow?
Check your understanding
Find an example, an application and a limit. Explain the concept without using its name, then compare your explanation with a primary source.
Loading your learning…
Claims to examine
Macroscopic entropy increase requires statistical and boundary-condition assumptions in addition to microscopic dynamics.
Follow a learning route
Why does time have an arrow?
Connect energy, entropy, statistical ensembles and nonequilibrium processes without confusing microscopic laws with macroscopic trends.