Thermodynamics of Interfaces. And you thought this was just for the chemists. Terms. Intensive Variables P: pressure Surface tension T: Temperature (constant) Chemical potential. Extensive Variables S: entropy U: internal energy N: number of atoms V: volume Surface area.
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And you thought this was just for the chemists...
Key Concept: two kinds of variables
Intensive: do not depend upon the amount (e.g., density)
Extensive: depend on the amount (e.g., mass)
Gaseous phase ‘g’
Interface phase ‘a’
Liquid phase ‘l’
SadT = d [2.29]
TdS = dU + PgdVg + PldVl - (dNg+dNl ) - d [2.31]
TdS = dU + PgdVg + PldVl - (dNg+dNl) - d [2.31]
Pd r2 = 2r [2.35]
and remain equal through any reversible process
As before, we have one for each bulk phase