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This lesson covers specific latent heat as required by the AQA GCSE Physics specification (4.3.2). Specific latent heat is the quantity of energy needed to change the state of a substance without changing its temperature. This concept explains why it takes a lot of energy to melt ice or boil water, even though the temperature does not change during these processes.
Latent heat is the energy required to change the state of a substance without changing its temperature. The word "latent" means "hidden" — the energy is "hidden" because it does not cause a temperature rise. Instead, the energy is used to overcome the forces of attraction (bonds) between particles.
There are two types of latent heat:
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