Particles in gases

• Gases take up more space than solids or liquids and their particles are moving much faster.
• The temperature, pressure and volume of gases are all related.
• The particles in a gas are moving very quickly in random directions, with speeds that vary but, on average, move quicker than they do in liquids and solids.
• Gas pressure is the force acting on the container due to these frequent collisions, which is at right angles to the container.
• The greater the pressure, the greater the force exerted over the same area.
• The pressure in the atmosphere at sea level is about 100,000 N/m 2.
• The pressure from gas molecules may increase if there are more molecules colliding each second or if the molecules are moving faster.