Discussion
State whether the following is true or false.
Relative humidity and percentage humidity are the same quantity.
Answer: A
Correct answer: False
They are close but not equal. Relative humidity is the ratio of partial pressures, \( p/p_s \); percentage humidity is the ratio of absolute humidities, \( Y/Y_s \). Because absolute humidity depends on \( p/(P-p) \) rather than on \( p \) alone, the two differ by a factor of \( (P-p_s)/(P-p) \) - negligible at low humidity and appreciable near saturation and at raised temperature.
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