Lesson 3, Topic 2
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Heating curves

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Heating and cooling curves

Heating and cooling curves are graphs showing how the temperature changes when a substance is heated or cooled at a steady rate

A-B: An input of energy increases the temperature of the solid

B-C: The energy is being used to reduce the attractive forces between the particles in the solid. So is not available to raise the temperature

C-D: The energy increases the temperature of the liquid

D-E: The energy is being used to overcome the attractive forces between the particles in the liquid. So is not available to raise the temperature

E-F: The energy increases the temperature of the gas