Refrigeration and Air Conditioning
During heating and humidification, the final relative humidity of air

None of the listed here
Is higher than that of the entering air
Can be lower or higher than that of the entering air
Is lower than that of the entering air

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Refrigeration and Air Conditioning
The relative humidity is defined as

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
The mass of water vapour present in 1 kg of dry air
The mass of water vapour present in 1 m3 of dry air
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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