[Music] hi and welcome back to free science lessons. co.uk by the end of this video you should be able to describe how the temperature of a gas is related to the energy of the particles you should then be able to describe how changing the temperature of a gas changes the pressure now this is a pretty easy topic so it's a relatively short video we've already looked at gases in previous videos remember that particles in a gas are very far apart and they're in constant random motion now in this video we're looking at the pressure of gases the pressure of a gas is due to the particles colliding with the walls of the container that the gas is held in I'm showing you here a gas held inside a container by colliding with the walls of the container the gas particles are exerting a pressure now we can increase the pressure if we increase the number of collisions per second or if we increase the energy of each collision and one way to do that is to increase the temperature of the gas I'm showing you here two containers containing gases at different temperatures now the first key idea you have to get is that the temperature of a gas is related to the average kinetic energy of the particles at low temperatures particles have got lower kinetic energy this means there are fewer collisions per second and these are are lower energy collisions this means that at lower temperatures the gas pressure is relatively low at high temperatures particles have got higher kinetic energy this means there are more collisions per second and these are higher energy collisions so at high temperatures the gas pressure is relatively High remember that you'll find plenty of questions on the pressure of gases in my vision workbook and you can get that by clicking on the link above okay so hopefully now you should be able to describe how the temperature of a gas is related to the energy of the particles you should then be able to describe how changing the temperature of a gas changes the pressure [Music]