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For the surface expansion of a liquid, the first law of thermodynamcs can be written as...

For the surface expansion of a liquid, the first law of thermodynamcs can be written as

dU = T dS + γdσ

where γ is the surface tension and dσ is the surface area expansion. Which Maxwell relation can be derived from this expression

a) (∂γ/∂S)σ = (∂σ/∂T)S

b) ( ∂S/∂σ)γ = (∂T/∂γ)S

c)(∂γ/∂S)S = (∂T/∂σ)S

d (∂S/∂γ)σ = (∂T/∂σ)S

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