the symbol used represent pressure in equations p or p si units of pascals.
when describing container of gas, term pressure (or absolute pressure) refers average force per unit area gas exerts on surface of container. within volume, easier visualize gas particles moving in straight lines until collide container (see diagram @ top of article). force imparted gas particle container during collision change in momentum of particle. during collision normal component of velocity changes. particle traveling parallel wall not change momentum. therefore, average force on surface must average change in linear momentum of these gas particle collisions.
pressure sum of normal components of force exerted particles impacting walls of container divided surface area of wall.
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