heating and cooling graphs

• Heating graph


  Graph showing temperature rising as a solid substance is gradually heated
• Heating graph


  1. Temperature of solid rises

  2. Temperature stops rising and becomes horizontal

  3. Solid changes state and turns into a liquid (melting)

  4. Temperature starts rising again
• Latent heat


  Energy needed for a substance to change state
• Melting point


  Temperature at which a solid changes to a liquid
• Heating graph continued


  1. Temperature stops increasing and line becomes horizontal again

  2. Substance is boiling

  3. Energy is weakening/breaking forces of attraction between particles

  4. Boiling point can be found from graph
• Cooling graph


  1. Gas changes to liquid (condensation)

  2. Liquid changes to solid (freezing)