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
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with plants and cause greenhouse effect
These react with water vapour and cause acid rain
These react with oxygen and cause its depletion
These react with ozone layer

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