Heating and Cooling

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When we know the temperature of something, we know how hot it is, not how much heat/thermal energy it contains. Temperature is measured in degrees Celcius, whilst heat is measured in joules (J).

The amount of heat or thermal energy in something depends on:

  • How hot it is (its temperature)
  • The material it is made from
  • Its mass

Heating makes a material expand, whilst cooling makes a material contract.

Conduction takes place in solids. Metals are the best conductors. Most other solids are poor conductors.

Convection takes place in liquids…

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