The **ideal gas law** is the equation of state followed by ideal gases. The general case equation is^{1}:

$$ pV = Nk_\text{B}T .$$

Here $p$ is the pressure of the gas, $V$ is the volume it consumes, $N$ is the amount of particles it consists of, $k_\text{B}$ is the Boltzmann constant and $T$ is the temperature.

^{1}

Malthe-Sørenssen, A., & Dysthe, D. K. (2017). Statistical and Thermal Physics Using Python.