Notes
Temperature & Heat: Latent Heat
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Latent Heat
The latent heat of a body is the amount of heat required to change its state without a change in temperature
As it is a form of heat energy, it is a scalar quantity and measured in Joules
Specific Latent Heat
The amount of heat required to change the state of 1 kg of a substance without a change in temperature
Scalar quantity
Unit = Joule per kilogram
Here is a graph illustrating latent heat
Fusion is a change of state from solid to liquid
Vaporisation is a change of state from liquid to gas
Q = ml
Q = energy (supplied or withdrawn)
m = mass of body
l = specific latent heat
Specific Latent Heat of Fusion
Amount of heat required to change 1 kg of a substance from a solid to a liquid without a change in temperature
3.3 x 10⁵ J/ kg
Specific Latent Heat of Vaporisation
Amount of heat required to change 1 kg of a substance from a liquid to a gas without a change in temperature
2.3. x 10⁶ J/ kg
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- This note covers latent heat and specific latent heat. It also discusses the specific latent heat of vaporisation and fusion.
- Created by
- tatemae.honne · Jan 2014
- Updated
- Dec 7, 2016
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- Created by alex.examtime9373 · Jan 21, 2014
- Copied by tatemae.honne · Jan 21, 2014
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