Answer to Question #136307 in Physical geography for Varun Nadig

Question #136307
Assuming that a different air mass has a relative humidity of 40% at a temperature of 25 degrees Celsius, what is the actual humidity content, expressed as g/kg?
1
Expert's answer
2020-10-05T06:43:27-0400

The relative humidity is defined by the following expression (http://www.classzone.com/vpg_ebooks/ml_earthscience_na/accessibility/ml_earthscience_na/page_392.pdf):


"RH = \\dfrac{Actual\\space humidity}{Maximum \\space humidity}\\times 100\\%"

where "Maximum \\space humidity" is the maximum gramms of water that one kilogram of air can hold at given temperature (units "g\/kg" ). For temperature "25\\degree C", have (see https://www.engineeringtoolbox.com/humidity-ratio-air-d_686.html):


"Maximum \\space humidity = 19.8\\space g\/kg"

Thus, the "Actual\\space humidity" is:

"Actual\\space humidity = \\dfrac{RH\\times Maximum \\space humidity}{100\\%} = \\dfrac{40\\%\\times 19.8}{100\\%}=\\\\\n=7.92\\space g\/kg"

Answer. "7.92\\space g\/kg".


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