Discussion
Air at 30 degrees Celsius has a water partial pressure of 2 kilopascals when the saturation pressure is 4.24 kilopascals. What is the relative humidity?
Answer: B
Two divided by four point two four is about forty-seven per cent. The saturation pressure must be read at the actual air temperature, not at some standard condition. The ratio is dimensionless and independent of the total pressure.
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