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On a particular hot day, the temperature is 40°C and ...

On a particular hot day, the temperature is 40°C and the partial pressure of water vapor in the air is 38.8 mmHg. What is the relative humidity?

 

On a particular hot day, the temperature is 40°C and the partial pressure of water vapor in the air is 38.8 mmHg. What is the relative humidity?

 

A.

70

B.

62

C.

80

D.

42

Correct answer is A

Relative Humidity=  partialpressureofH2OsaturatedvaporpressureofH2O×100%

S.v.p. of water at 40°c = 55.3

⇒ Relative Humidity=  38.855.3×100%

Relative Humidity= 70%