— one of the main gas laws, according to which the pressure of the mass of an ideal gas at constant volume varies linearly with temperature changes: $$p_{t}=p_{0}(1+\beta t)$$ where $p_{t}$ and $p_{0}$ — gas pressure at temperatures $t$ and $0\ ^{\circ} \! {\mathrm{C}}$ respectively, $\beta=1 / 273,15 \mathrm{k}^{-1}$ — temperature coefficient of pressure, established in 1787 France. scientist Jean Charles (1746-1823).