Discussion
Which behaviour does relative humidity show when air is warmed at constant pressure?
Answer: B
Warming raises the saturation vapour pressure while leaving the actual vapour pressure unchanged, so the ratio falls. This is why heated indoor air in winter feels dry despite containing the same amount of water as the cold air outside. The common phrase about warm air holding more water is misleading, since the vapour pressure depends on temperature rather than on any capacity of the air to contain it. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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