Refrigeration and Air Conditioning
Dry bulb temperature is the temperature of air recorded by a thermometer, when

The moisture present in it begins to condense
Its bulb is surrounded by a wet cloth exposed to the air
It is not affected by the moisture present in the air
None of the listed here

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Refrigeration and Air Conditioning
A one tonne refrigerating machine means that

One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min
One tonne refrigerant is used
One tonne is the total mass of machine
One tonne of water can be converted into ice

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Refrigeration and Air Conditioning
The relative humidity is defined as

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

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