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GCSE Combined Science · key term
The energy required to change the state of one kilogram of a substance with no change in temperature, measured in J/kg.
Used by AQA and Edexcel
Specification 6.3.2.3 · Paper 5
Revise: Specific Latent HeatSpecific latent heat is the energy required to change the state of one kilogram of a substance with no change in temperature. Its unit is joules per kilogram, J/kg. The word ‘specific’ tells us that the energy is quoted per kilogram, rather than for an unspecified amount of material.
Paper 5, Paper 6
The energy needed to change the state of 1 kg of a substance without changing its temperature. Its unit is J/kg.
Revise: Heating, specific heat capacity and latent heatSpecific latent heat of fusion applies to melting or freezing; specific latent heat of vaporisation applies to boiling or condensation. Melting and boiling require energy transfers into the substance. Freezing and condensation transfer energy out.
A definition of specific latent heat must include one kilogram and no change in temperature.
Include ‘without changing its temperature’ when defining specific latent heat.
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