A mixture of dry air and water vapour is at a temperature of 21°C under a total pressure of 736 mm Hg the dew point temperature is 15° C. The partial pressure of water vapour at 15° C is 12.79 mm Hg. Saturation pressure of water vapour at 21° C is 18.65 mm Hg. The relative humidity is 1) 50% 3) 68.5% 2) 58% 4) 74.6%

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