165) The cooling of air, without any change in its specific humidity, is known as sensible cooling.

166) The capacity of the cooling tower and spray ponds __________ as the wet bulb temperature of air decreases.

167) A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called

168) 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

169) The expansion valve in a refrigerator controls the flow of refrigerant.