Sackur–Tetrode Equation

#Physics

$\displaystyle \sigma=N\left( \ln \frac{n_{Q}}{n}+\frac{d}{2}+1 \right)$

• $\displaystyle \sigma$ is the fundamental entropy
• For ideal gases in 3D
• $\displaystyle n$ is the density of particles per unit volume
• $\displaystyle n_{Q}$ is the quantum concentration
• $\displaystyle d$ is the number of spatial dimensions