Discussion
Match each humidity measure with its definition.
List I
A. Absolute humidity
B. Molal humidity
C. Relative humidity
D. Percentage humidity
List II
1. partial pressure over saturation pressure
2. mass of water per mass of dry air
3. absolute humidity over saturation humidity
4. moles of water per mole of dry air
Answer: D
Correct answer: A-2, B-4, C-1, D-3
Four measures in two pairs. Absolute humidity is a mass ratio and molal humidity the same quantity in moles - both absolute amounts of water per unit of dry air. Relative humidity and percentage humidity are both fractions of saturation, the first taken on partial pressures and the second on humidities. The distinction between the last two is the subject of the next item.
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