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.
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
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.
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).
Lesson 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