P1.5 Specific Latent Heat

• What is the specific latent heat of fusion?

  The specific latent heat of fusion refers to when a substance changes from solid to a liquid (or from a liquid to a solid).
• What is the formula that links energy, latent heat, and mass?

  Energy (E) = mass (m) x latent heat (L)
• Why does the temperature of a a substance remain constant while it is melting or boiling?

  The temperature remains constant because energy is used to break the forces holding the particles together rather than being transferred to the particle's kinetic energy store.
• What is the specific latent heat of vapourisation?

  The specific latent heat of vapourisation refers to when a substance changes from a liquid to a gas (or from a gas to a liquid).
• What is specific latent heat?

  The specific latent heat is the energy required to change 1kg of a particular substance from one state to another, without a change in temperature.
• What happens to the temperature of a substance whilst it changes state?

  The temperature remains constant.
• The boiling point.

  
• What will a temperature-time graph look like for a solid being heated until it turns into a gas?


  like this:

  
• The melting point.