1.  The total pressure of the two components and the partial pressure of the more volatile component increase as the mole fraction of the more volatile component increases.

2.  The partial vapour pressure of the less volatile component decreases at the same time.

3.  The more volatile component is the one whose molecules have a greater tendency to escape into the vapour phase.

4.  The more volatile component is thus the one with the higher vapour pressure.

5.  The vapour is a mixture of the more volatile component A and the less volatile component B.

6.  The particles of the more volatile component have a greater tendency to escape from the liquid than the particles of the less volatile component.