Specific latent heat

• Specific latent heat is measured in J/kg
• Energy = mass x specific latent heat
• The energy required to change the state of 1kg of a substance without a change in temperature.
• Describes the energy to boil or condense.
• What graph is this?

  Heating

  
• What graph is this?

  Cooling

  
• When you heat a solid or a liquid, you're transferring energy to the kinetic energy stores.
• When a substance is melting or boiling, you're still putting in energy, but the energy is used for breaking bonds rather than raising the temperature.
• When a substance is condensing or freezing, bonds are forming between particles which releases energy, this means the temperature doesn't go down until the substance turns into a solid or a liquid.
• Specific latent heat is the energy needed to change state.