The relative humidity is defined as

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The relative humidity is defined as

Options:

A . The mass of water vapour present in 1 m3 of dry air

B . The mass of water vapour present in 1 kg of dry air

C . The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure

D . The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

Answer: Option D

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