Energy transfer by heat

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  • Energy Transfer By Heat
    • Thermal Energy
      • transferred by conduction, convection and Radiation
  • Conduction-  involves paticles and happens in metals because  of metal ions and free electrons
    • Convection- happens in liquids and gasses because particles need to move freely. Involved convection currents
      • Radiation- thermal radiation also called I.R. ( inferred radiation)
  • the Hotter an object, more i.r. emmited
  • Part of electromagnetic spectrum. no particles
  • Dark surfaces absorb more i.r. than light surfaces
  • long thin objects  emmit more i.r. and fat  short objects


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