Cooling curve of water

An example figure from the Heating and Cooling Curve generator.

Cooling curve of water from steam at 120 °C to ice at −20 °C, with plateaus labeled Condensing at 100 °C and Freezing at 0 °C — The temperature of water cooled steadily from steam at 120 °C to ice at −20 °C, against time. The curve falls through the gas, stays flat at 100 °C while the steam condenses, falls through the liquid, stays flat at 0 °C while the water freezes, then falls through the solid. The sloped segments are labeled with their states and the plateaus with the changes, and the temperatures are written by the dashed lines.

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Answer key

Water: melting point 0 °C, boiling point 100 °C
A–B: Gas cools from 120 °C to 100 °C
B–C: Condensing at 100 °C
C–D: Liquid cools from 100 °C to 0 °C
D–E: Freezing at 0 °C
E–F: Solid cools from 0 °C to −20 °C

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