Explain the effect of pressure on boiling point of liquid and melting point of ice

(i)  Effect of pressure on boiling point of a liquid.

When the liquid boils its saturated vapour pressure = external pressure and saturated vapour pressure increases with increasing temperature. When external pressure is raised, a liquid will boil at higher saturated pressure which occurs at high temperature.

(ii) Effect of pressure on melting point of ice.

Increase in pressure lowers the melting point of ice because melting of ices is followed by a decrease in volume.

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Dr. Bbosa Science