Refrigeration and Air Conditioning
The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called

Kinetic theory of gases
Avogadro's hypothesis
Newton's law of gases
Dalton's law of partial pressures

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Refrigeration and Air Conditioning
One ton of the refrigeration is

The refrigeration effect to produce 1 ton of ice at NTP conditions
The cooling effect produced by melting 1 ton of ice
The standard unit used in refrigeration problems
The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours

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