The partial pressure of a gaseous substance S in a gaseous mixture is .......... : The law which connects this pressure to the volume of the mixture and to its temperature is the law of perfect gases: .......... wher V is .......... nS is .......... T is .......... R is the perfect gas constant which is .......... The partial pressure of a gas can be expressed as a function of the molar concentration (molarity) of this gas: .......... The sum of the partial pressures of all the gases in a mixture is equal to ..........