# Looking for an Einstein Paper

Hello

I am looking for a certain paper by Albert Einstein (sometime between 1905 and 1920), where Einstein discusses Entropy - in this paper, he presents entropy, but then says that the term in the exponential or logarithm (cant remember which) need to be dimensionless. So he divides the term with a constant that has the same units. This is a rather subtle line...perhaps a paragraph or two. I've been going over his papers from 1900 to 1909 but not having much luck.

Any ideas? Thanks!