JAMB Physics 2022 Paper

Concept:Vapour pressure increases with temperature, but the increase is not a straight-line relationship.Explanation:When temperature rises, more molecules gain enough energy to escape from the liquid surface.Therefore, the vapour pressure increases as temperature increases.This relationship is non-linear and exponential.It is described by the Clausius–Clapeyron equation:$$\ln P = -\frac{\Delta H_{\text{vap}}}{RT} + C$$This equation shows that a small change in temperature causes a large, non-linear change in vapour pressure.Thus, vapour pressure increases non-linearly with increasing temperature.Answer:A. increases non-linearly with increasing temperature.