Specific Latent Heat Simplified Revision Notes for GCSE AQA Physics

Revision notes with simplified explanations to understand Specific Latent Heat quickly and effectively.

Learn about Internal Energy & Energy Transfers for your GCSE Physics Exam. This Revision Note includes a summary of Internal Energy & Energy Transfers for easy recall in your Physics exam

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3.2.4 Specific Latent Heat

Specific Latent Heat

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The amount of energy needed to change the state of 1 kg of a substance without a change in temperature.

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Key Points:

The substance needs to be at the right temperature to change state first.
Specific Latent Heat of Fusion: Energy to melt/freeze.
Specific Latent Heat of Vaporisation: Energy to boil/condense.

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Formula: Energy for a change of state = mass × specific latent heat

E = mL

Where:

$E$ = energy for a change of state (Joules, J)
$m$ = mass (kilograms, kg)
$L$ = specific latent heat (Joules per kilogram, J/kg)

Table of Variables

Variable	Symbol	Units
Energy for Change of State	$E$	Joules (J)
Mass	$m$	Kilograms (kg)
Specific Latent Heat	$L$	Joules per kilogram (J/kg)

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