IGCSE Coordinated Science: Pressure Changes

IGCSE Coordinated Science: Pressure Changes

1. Relate the change in volume of a gas to change in pressure applied to the gas at constant temperature and use the equation:

Quantitatively

This is definitely an equation you should try to learn. We call this the ideal gas law although we don’t need certain parts of the equation here.

Firstly, R is a constant with a value of approximately 8.31 but that is quite irrelevant for GCSE standards. Basically, as you increase the Volume of a gas, the pressure of the gas sample decreases.

Quantatitively 2

Where k =constant, p = pressure , v = volume.

This is the rearrangment of what we call “Boyle’s Law”, and notice that Pressure is inversely proportation to Volume. Basically what that means is that as Volume increases, the pressure tends to decrease.

Below is an accurate depiction of what is happening here:

Basically, here as pressure increases, volume decreases at a proportional rate.

The qualitative description can be seen through the diagram above.

As you increase the volume, the particles in the container will have a larger volume to collide against, so therefore the overall concentration of the collisions will decrease as each particle hence decreasing the overall pressure.

I’ll give you an analogy. If you’re in a small room and were forced to constantly walk around randomly, you will obviously hit the wall more often than if I put you in a larger room. What happens here is the frequency of the collisions increases as you decrease volume, hence increasing the pressure.

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