Question

a) calculate the percent relative humidity when temperature is at 30 degree Celsius and air contain 10 gram of water vapor per cubic meters.

b) calculate the percent relative humidity when the temperature is at 30 degree Celsius and dew point is at 5 degree Celsius.

Answer 1

(a) % Relative humidity

= Actual vapor density *100 / Saturation vapor density at 30°C

= 10g per cubic metre*100 / 30.4 g per cubic metre

= 32.9% (ANSWER a)

(b) % Relative Humidity = 100* exp((17.625*Td)/(243.04+Td)) / exp ((17.625*T) / (243.04 + T))

= 100* exp((17.625*5)/(243.04+5)) / exp ((17.625*30) / (243.04 + 30))

= 100* exp(88.125 / 248) / exp (528.75 / 273.04)

= 100* exp(0.355) / exp (1.936)

= 100* 1.426 / 6.930

= 20.6% (ANSWER)

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