Hello I recently was reading this question and the top answer had this line “Remember that you cannot do classical thermodynamics without equilibrium anyway.” I want an explanation of this line. The answer was made 6 years ago and the answerer’s account seems to have been deleted. So commenting on the answer won’t help.
I guess I feel my question is too trivial to make a new post.
I searched a bit and this answer just keeps defining what thermal equilibrium is. What should I do?