Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Expansion valve to the evaporator
Evaporator to the thermostat
Condenser to the evaporator
Condenser to the expansion valve

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Refrigeration and Air Conditioning
For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then

Perfectly tight vapour seal should be used
Refrigerant with lower evaporation temperature should be used
Bigger cabinet should be used
Smaller cabinet should be used

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Refrigeration and Air Conditioning
The relative humidity is defined as

The mass of water vapour present in 1 kg of dry air
The mass of water vapour present in 1 m3 of dry air
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
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

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