Posted by **Sean** on Tuesday, May 5, 2009 at 1:41pm.

In my physical chemistry book, I'm reading about "Margules Equations":

ln γ

_{A} = Βx

_{B}^{2}
ln γ

_{B} = Βx

_{A}^{2}
I don't understand where these equations come from. How is it known that there is a single constant Β that satisfies both relationships?

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