# What units of measurement are used for the combined gas law?

Well, clearly we use $\text{degrees Kelvin}$...i.e. units of $\text{absolute temperature....}$
...beyond that we use convenient units of pressure and volume. For chemists, these are typically $m m \cdot H g$, where $1 \cdot a t m \equiv 760 \cdot m m \cdot H g$...and $\text{litres}$...$1 \cdot L \equiv 1000 \cdot c {m}^{3} \equiv {10}^{-} 3 \cdot {m}^{3}$....
$\frac{{P}_{1} {V}_{1}}{T} _ 1 = \frac{{P}_{2} {V}_{2}}{T} _ 2$...of course we have to use the units consistently....