In Part 1, I explained my hopes that classical statistical mechanics reduces to thermodynamics in the limit where Boltzmann’s constant approaches zero. In Part 2, I explained exactly what I mean by ‘thermodynamics’. I also showed how, in this framework, a quantity called ‘negative free entropy’ arises as the Legendre transform of entropy.

This is a companion discussion topic for the original entry at https://johncarlosbaez.wordpress.com/2024/09/16/the-space-of-physical-frameworks-part-4/