Ideal Gas Law
PV = nRT
which states that pressure, P, and volume, V, is equal to the amount of the material, n, multiplied by the temperature, T, and a constant, R.
Using SI units, the pressure is expressed in pascals, the volume in liters, the amount in moles and the temperature in degrees Kelvin.
The ideal gas law incorporates both [Charles Law]? and [Boyles Law]?.