GCSE Physics Revision: Thermal Physics Extended theory paper

Thermal Physics

Fig. below shows the path that one molecule, M, in a gas might take.

Thermal Physics 101

(a) Explain why in the figure above, the path of M has sudden, sharp changes of direction.

(b) At the end of the short time interval, M is a short distance from its starting point. Use this observation to explain why a gas spreads slowly through the air.