Heat transfer

P1a 1.1 for AQA'S GCSE physics

HideShow resource information

Thermal radiation + Surfaces and radiation

  • Thermal radiation is energy transfer by electromagnetical waves.
  • All objects emit thermal radiaton.
  • The hotter/more energy an object is the more energy it emits.
  • Dark matt surfaces are better emitters of thermal radiation than light shiny surfaces.
  • Dark matt surfaces are better absorbers of thermal radiation than light shiny surfaces.
1 of 3

Conduction and Convection

  • Conduction in a metal is due to mainly to free electrons inside the metal.
  • Non-metals are generally poor conductors as they do not contain free electrons.
  • Materials such as fiberglass are good insulators because they contain pockets of trapped air.
  • Convection takes place only in fluids (liquids and gases)
  • Heating a fluid makes it less dense.
  • Convection is due to a hot liquid or gas rising.
2 of 3

Heat transfer by design

  • Small objects lose heat more easilly than large objects.
  • Heat loss from a building can be reduced by using: aluminum foil behind radiators, cavity wall insulating, double/ triple glazing, loft insulation and under floor insulation.
  • Example: radiators have a large surface area to disperse its heat quickly.
3 of 3


No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Energy resources »