When does a substance release heat?

(Note: This is about the changing state of matter.)

Heat is released when a substance changes from a gas to a liquid, or from a liquid to a solid.
When a liquid changes to a solid, we refer to that as the process of 'freezing'.

Answered by AL2006 | 2024-06-10

Heat is released when a substance undergoes phase changes such as condensation (gas to liquid) and freezing (liquid to solid). These processes are known as exothermic reactions, where energy is emitted as the molecules transition to a more stable state. The heat released during these transformations can significantly affect the environment around the substance.
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Answered by AL2006 | 2024-10-01