As the temperature of a liquid rises, its vapour pressure
Correct answer: C. increases
- A. decreases
- B. remains constant
- C. increases
- D. first increases and then decreases
Explanation
Higher temperature means a larger fraction of molecules have enough kinetic energy to escape the surface, so more vapour is present at equilibrium and the pressure rises, following an exponential rather than a straight line relationship. The boiling point is simply the temperature at which this rising curve meets the external pressure. This is why a liquid in a sealed container can burst it when heated.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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