The units of pressure and volume do not matter however the units much match for both P 1 and P 2 and for V 1 and V 2. Luckily we have already done this above under. The rule is that to find the value of the unknown variable you must mathematically isolate the unknown variable by itself and in the numerator of one side of the equation.
Ie in equation form pv k a constant.
It states the pressure of a gas is inversely proportional to the volume of the gas at a constant temperature and for a fixed amount of the gas. P1 V1 P2 V2. It states the pressure of a gas is inversely proportional to the volume of the gas at a constant temperature and for a fixed amount of the gas. Similarly p₂ and V₂ are the final values of these gas parameters.