Specific latent heat (E = m L)
I can make calculations using the equation E = m × L
Specific latent heat (E = m L)
I can make calculations using the equation E = m × L
Lesson details
Key learning points
- Energy transferred to a solid at its melting point allows its particles to move further apart.
- Energy transferred to a liquid at its boiling point allows its particles to move fast enough to get even further apart.
- The energy transferred to melt a solid at its melting point is proportional to the mass of the solid.
- The energy transferred to melt 1 kg of a solid at its melting point is proportional to the solid’s specific latent heat.
- The energy transferred to boil 1 kg of a liquid at its boiling point is proportional to its specific latent heat.
Common misconception
The temperature of ice is always 0ºC and the temperature of water in the liquid state cannot be 0°C.
Make explicit observations that water can be in either or both of the solid and liquid states at 0°C.
Keywords
Melting - the change of state from a solid to a liquid; happens at a fixed temperature for pure substances
Boiling - the change of state from a liquid to a gas; happens at a fixed temperature for pure substances
Specific latent heat - the change in energy when 1 kg of a substance changes state
Specific heat capacity - the change in internal energy when the temperature of 1 kg of a substance changes by 1°C
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
Exit quiz
6 Questions
the change from a solid state to a liquid state
the change from a liquid state to a gas state
the energy transferred when 1 kg of a substance changes state
the change in internal energy when temperature of 1 kg changes by 1°C