Refrigeration and Air Conditioning
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, is called

Absolute humidity
Degree of saturation
Humidity ratio
Relative humidity

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Refrigeration and Air Conditioning
A good refrigerant should have

High operating pressures and low freezing point
Low C.O.P. and low freezing point
High latent heat of vaporisation and low freezing point
High specific volume and high latent heat of vaporisation

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