Refrigeration and Air Conditioning
In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

Collect vapours
Detect liquid in vapour
Superheat the vapour
Collect liquid refrigerant and prevent it from going to compressor

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

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