Refrigeration and Air Conditioning
Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

μ/[1 - (1 - μ) (Ps/Pb)]
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]
0.622 Pv / (Pb - Pv)
None of these

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

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

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