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This question is 4 marks so you need to make at least 4 points.

These types of questions just require memorising the 4 points:

Lots of molecules collide with the walls.

Step 1 - Identify the difference between the required form of the answer and the expression to be simplified: 

It can be...

A medical school personal statement needs to be as unique as you can possibly make it as the markers read thousands every year. On such a tight word count, every sentence needs to have a purpose to eit...