Refrigeration and Air Conditioning
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, is called

Relative humidity
Absolute humidity
Humidity ratio
Degree of saturation

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Refrigeration and Air Conditioning
In a bootstrap air evaporative cooling system, the evaporator is provided

Between the second heat exchanger and the cooling turbine
Between the combustion chamber and the first heat exchanger
Between the first heat exchanger and the secondary compressor
Between the secondary compressor and the second heat exchanger

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