Ideal gas Helmholtz energy function
From equations
and
- Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle A=-k_{B}T\ln Q_{NVT}}
one has
using Stirling's approximation
- Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle =-k_{B}T\left(-N\ln N+N+N\ln N-N\ln \Lambda ^{3}\rho \right)}
one arrives at
Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle A=Nk_BT\left(\ln \Lambda^3 \rho -1 \right)}