Hello;(adsbygoogle = window.adsbygoogle || []).push({});

"[itex]S\propto\ln\Omega[/itex], where [itex]\Omega[/itex] is the number of microstates" is what a user told me was the fundamental definition of entropy. What is S? Is it the number of macrostates? And where does the ln come from? Can I see an example of where this formula would be used in practice?

Thanks.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Fundamental definition of entropy

**Physics Forums | Science Articles, Homework Help, Discussion**