P3 : Pressure in Gases

Question 1

Gas pressure

Answer 1

The pressure of a gas is due to the particles colliding with the walls of the container that the gas is held in
The particle collisions cause a force which acts at right angles to the walls of the gas container
this force acting over the area of the container causes gas pressure
If we take the same gas and increase the volume of the container (while keeping the temperature constant) then we reduce the pressure because we have no increased the spacing between the particles. Particles now travel much further before colliding with the walls of the container reducing number of collisions per second reducing pressure

Question 2

Inverse proportion

Answer 2

The pressure of a gas is inversely proportional to the volume. If the volume increases, then the pressure decreases

Question 3

Formula for constant

Answer 3

pV = Constant
p = pressure (Pa)
B = volume (m3)
Because the pressure multiplied by the volume is a constant, if we have double the pressure, then we halve the volume