Discussion
Which ordering holds among temperature, wet bulb and dew point in unsaturated air?
Answer: A
In unsaturated air the three are ordered with the actual temperature highest and the dew point lowest, and they converge to a single value at saturation. The wet bulb lies between because evaporating water cools the thermometer but also raises the vapour pressure. Checking this ordering is a quick way of validating a set of observations, since any other arrangement indicates an error. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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