Question

a) What are the pressure of water and the dew point in a system in which the relative humidty is 22.3% at 35 ^oC?

Pressure of water =	torr
Dew Point =	oC

b) The pressure of water vapor in the atmosphere is found to be 17.5 when it is 35 ^oC. What are the dew point and relative humidty?

Dew Point =	oC
Relative Humidity =	%

Answer 1

% Relative humidity= 100*(partial pressure of water vapor/ Vapor pressure of liquid)

at 35 deg.c, Vapor pressure of water = 42.2 mm Hg

0.223= Partial pressure of water vapor/ 42.2

Partial pressure pf water vapor = 42.2*0.223=9.4 mm Hg

at dew point, partial pressure of water vapor= Vapor pressure of liqud =9.4 mm Hg

This correspond to a temperature of 10.2 deg.c

b) Relative humidity = 100*partial pressure of water vapor/ Vapor pressure of liquid at 35 deg.c= 100*17.5/42.2=41.46%

At dew point partial pressure of water vapor = Vapor pressure of liquid = 17.5mm Hg

This correspond to 20 deg.c dew point