A parcel of air cools during the night without gaining or losing any water vapour. What happens to its relative humidity?

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Question

A parcel of air cools during the night without gaining or losing any water vapour. What happens to its relative humidity?

Accepted Answer

It rises, because cooler air can hold less vapour, so the same amount represents a larger proportion of the maximum — Award 1 mark. Once it reaches 100% the air is saturated and dew or mist forms.

Answer

It cannot be determined without knowing the pressure

Answer

It falls, because cool air holds more vapour

Answer

It stays the same, because the amount of vapour is unchanged

Answer

It rises, because cooler air can hold less vapour, so the same amount represents a larger proportion of the maximum

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