- #1

"Assuming the vapor of solid phase obeys the ideal gas law, for the flat surface one can easily arrive at:

*μ*

_{v}−

*μ*

_{∞}=

*−kT*ln

*P*

_{∞}, where

*μ*

_{v}is the chemical potential of a vapor atom,

*μ*

_{∞}, the chemical potential of an atom on the flat surface,

*k*, the Boltzmann constant,

*P*

_{∞}, the equilibrium vapor pressure of flat solid surface, and

*T*, temperature."

My first impression is that the two chemical potentials should be equal for the solid and its vapor pressure at equilibrium. Could somebody please explain to me how this formula is derived?

Thank you.