Express in terms of the temperature function and the partition

Cesar Mcguire

Cesar Mcguire

Answered question

2022-05-18

Express in terms of the temperature function and the partition function the form of the Helmholtz equation.

Answer & Explanation

Abigailf91er

Abigailf91er

Beginner2022-05-19Added 13 answers

The entropy is to be evaluated in the first case, then the Helmholtz free energy
The partition function is Z and the temperature is T.
s = k [ N ln N i = 0 N i ln N i ] = k [ N ln N N i ϵ i l k B T Z ln N ( ϵ l k B T Z ) ] = k [ N ln N N ln N + N ln Z + N k B T ϵ i e ϵ i l k B T Z ]
S = k B [ N ln Z + U K B T ] = N k B ln Z n + U T = k B ln Z N + U T = k B ln z + U T U = N i = 0 ϵ i l k B T Z
for indistinguishable particles,
z = Z N
for Helmholtz free energy,
F = U T S = U T [ U T + k B ln z ] = k B T ln z
Answer: Helmholtz energy F in terms of T and z is
F = k B T ln z

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