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?

Expert's answer

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):

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):

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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