Heating and cooling Graphs

• Heating a solid substance

  1. Temperature rises

  2. Temperature stops rising, becomes horizontal (solid changes to liquid)

  3. Temperature rises again
• Melting point


  Temperature at which a solid changes to a liquid
• Latent heat


  Energy needed for a substance to change state
• Heating a liquid substance

  1. Temperature rises

  2. Temperature stops increasing, becomes horizontal (liquid changes to gas)

  3. Temperature rises again
• Boiling point


  Temperature at which a liquid changes to a gas
• Cooling a gas


  1. Temperature decreases

  2. Temperature stops decreasing, becomes horizontal (gas changes to liquid)

  3. Temperature decreases again
• Condensation


  Change of state from gas to liquid
• Freezing


  Change of state from liquid to solid
• You can find plenty of questions on heating and cooling graphs in the revision workbook