When a volume of gas is enclosed in a container, the molecules/atoms forming the gas move about within the container, colliding elastically with each other, and the sides of the container, creating pressure against the sides of the container. For "ideal gases" we relate the pressure, volume, and temperature for a given number of atoms/molecules of a gas with the Ideal Gas Law.
The Ideal Gas Law tells us PV = nRT where P is pressure in Pascals (or Newtons per square meters), V is volume in cubic meters, n is the number of molecules/atoms, in moles, which are contained (a mole is about 6.02 x 1023), R is the universal gas constant (287 Joules per kilogram per Kelvin), and T is temperature in Kelvins.
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