Specific latent heat

• What happens to the temperature of a substance whilst it changes state?

  It remains constant
• When a substance changes state from a liquid to a gas, it’s called boiling.

  During boiling, heat energy is used to break the forces holding the particles together.
• The specific latent heat is the energy requires to change 1 kg of a particular substance from one state to another, without a change in temperature.
• The specific latent heat of fusion refers to when a substance changes from a solid to a liquid (or liquid to solid).
• The specific latent heat of vaporisation refers to when a substance changes from a liquid to a gas, (or gas to liquid).
• Specific latent heat has the symbol L and units J/Kg.
• What is the formula for specific latent heat?

  E = M x L

  Energy = mass x specific latent heat