What is the effect of pressure on:
(i) volume
(ii) boiling point
(iii) viscosity of a liquid?

 

(i) Volume: The volume of a liquid decreases very little with increasing pressure because the liquids are almost incompressible.
(ii) Boiling point: The boiling point of a liquid increases with the increase of external pressure because more heating will be required to make the vapour pressure equal to the external pressure.
(iii) Viscosity: The viscosity of a liquid increases with the increase in pressure because with the increase in pressure, intermolecular forces in liquids become a bit stronger.