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)

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

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Refrigeration and Air Conditioning
The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil)

(td₂ -td₃)/( td₁ -td₃)
(td₃ -td₁)/( td₂ -td₃)
(td₁ -td₃)/( td₂ -td₃)
(td₃ -td₂)/( td₁ -td₃)

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