Discussion
Match each term in List I with its definition in List II.
List I
A. Humidity ratio
B. Relative humidity
C. Dew point
D. Wet bulb temperature
List II
1. Actual vapour pressure over saturation pressure
2. Mass of vapour per unit mass of dry air
3. Steady temperature of a wetted thermometer in moving air
4. Temperature at which saturation occurs on cooling
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Each term takes its standard definition. Humidity ratio (A) is the mass of vapour per unit mass of dry air (2). Relative humidity (B) is the actual vapour pressure over the saturation pressure at the same temperature (1).
Dew point (C) is the temperature at which saturation occurs on cooling at constant moisture content (4), and wet bulb temperature (D) is the steady reading of a wetted thermometer in moving air (3). The distractors mainly exchange the first two, which is the pairing to check: a mass ratio against a pressure ratio.
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