The diagram represents the path taken in air by a smoke particle, as seen in a Brownian motion experiment. The smoke particles can be seen through a microscope, but the air molecules cannot.

What conclusions about air molecules can be drawn from this observation of the smoke particles?

A can, containing only air, has its lid lightly screwed on and is left in strong sunlight.

State what happens to the pressure of the air in the can when it gets hot.

A can, containing only air, has its lid lightly screwed on and is left in strong sunlight.

In terms of molecules, explain your answer.