Engineering :: Refrigeration and Air conditioning

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Dew point is

[A].	Percentage of moisture contained in a sample of air	[B].	Partial pressure of water vapour in a sample of air
[C].	The temperature of water vapour in air starts	[D].	The temperature at which condensation of water vapour in air starts
[E].	The temperature at which ice starts melting in presence of air without external aid

Answer: Option D