Question: The relative humidity is defined as
Options
A : the mass of water vapour present in 1 m 3 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
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