Cooling curve with supercooling

An example figure from the Heating and Cooling Curve generator.

Cooling curve of water from 80 °C to −20 °C that dips 5 °C below the freezing point before rising back to 0 °C and freezing, corners lettered A to D — The temperature of water cooled steadily from 80 °C to −20 °C, against time. The liquid cools past its freezing point to −5 °C before ice starts to form, then the heat given out as it freezes warms it back up to 0 °C, written by the dashed line, where it stays until it has frozen. Its corners are lettered A to D.

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Answer key

Water: melting point 0 °C, boiling point 100 °C
A–B: Liquid cools from 80 °C to 0 °C
B–C: Freezing at 0 °C
C–D: Solid cools from 0 °C to −20 °C

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