Air in a room is at 35°C and 60% relative humidity (RH).

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Air in a room is at 35°C and 60% relative humidity (RH). The pressure in the room is 0.1 MPa. The saturation pressure of water at 35°C is 5.63 kPa. The humidity ratio of the air (in gram/kg of dry air) is_________.

1. 21.745 g/kg of dry air
2. 21g/kg of dry air
3. 21.745 m/kg of dry air
4. 21g/kg of dry air

Correct Option: A

φ =	P_w	= 0.6 =	P_w
	P_s		5.63

∴ P_w = 3.378 kPa
Humidity Ratio,

w = 0.622	P_w	= 0.622 ×	3.378
	P_s - P_w		100 - 3.378

= 0.021745 kg/kg of dry air
or 21.745 g/kg of dry air