A. Condensation
B. Evaporation
C. Photo Emission
D. Thermionic Emission

Correct Answer: Option A

A. Condensation

SEE ALSO  The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.

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