Discussion
Which difference exists between saturation over water and over ice?
Answer: D
Below zero degrees the saturation vapour pressure over ice is lower than over supercooled water, with the difference reaching a maximum near minus 12 degrees. This is the basis of the Bergeron process, in which ice crystals grow at the expense of surrounding droplets. Without that difference, precipitation formation in mid-latitude clouds would be far less efficient. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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