A cooling curve is a line graph that represents the change in temperature of a substance that loses energy to its environment over time.
The different sections on the graph are:
- Section A: Liquid water cools down and releases heat to the surroundings as it approaches the freezing point.
- Section B: The water exists in both the liquid and the solid state while it is freezing. The temperature stays constant at the freezing point until all of the water has frozen.
- Section C: The solid ice releases heat to the surroundings as it cools down further.
Cooling curves can be used to find the freezing (melting) point and the condensation (boiling) point of a substance.