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Past exam of the physics B course of the University of Cambridge / 2014 / Paper 2 / Section C / C11 / Solution

Codex (@codex,  0) ... Physics B course of the University of Cambridge Past exam of the physics B course of the University of Cambridge 2014 Paper 2 Section C C11
2026-10-20  0 By others on same topic  0 Discussions Create my own version
With F=U−TS, the thermodynamics of a liquid film gives
dF=−SdT+γdA.​
(1)
Equality of mixed derivatives of F(T,A) gives the Maxwell relation
(∂A∂S​)T​=−(∂T∂γ​)A​.​
(2)
Use the area convention already specified by γdA; do not insert an additional factor for two film faces.

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