3.3: particle model and pressure

the motion of molecules in a gas is a

constant, random motion

factors affecting average kinetic energy of a gas molecule are

the temperature, higher temperature, higher kinetic energy

increasing the temperature makes the gas pressure

increase as the kinetic energy increases and so particles collide more frequently so there’s a greater change in momentum and therefore greater pressure

what force does the pressure of gas exert on its container

net force acts at right angles to the containers surface and force increases with pressure

pressure and volume at a fixed mass at a constant temperature is

constant, pV= constant

unit for pressure is

pascals (Pa)

when you do work on a gas

pressure increases which can lead to temperature increase aswell

when pumping up a bike tire, the air inside gets hotter

because work is done on a gas when it is compressed so therefore it has higher internal energy and subsequently higher kinetic energy so temperature increases