Discussion
Supercooled water in a cloud is water that is
Answer: A
Correct answer: still liquid at a temperature below zero degrees
Pure water does not freeze at zero - it needs a surface to nucleate on, and in the absence of one it can remain liquid to about minus 38 degrees, where homogeneous freezing takes over. Cloud droplets are small and often clean, so supercooled liquid is normal rather than exotic, and it is what makes mixed phase clouds, aircraft icing and freezing rain possible.
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