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Title:

Heat Transfer

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Conduction: heat transfer within materials and between objects in contact ... Insulators poor conductor, delay transfer of heat (e.g. wood, wool, air) ... – PowerPoint PPT presentation

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Title: Heat Transfer


1
Heat Transfer
Heat is transferred in three basic ways CCR
2
Conduction heat transfer within materials and
between objects in contact
  • Vibrating loose atoms transferring energy to
    neighbors
  • Conductors conduct heat well (e.g. metals
    silver, copper, iron)
  • Insulators poor conductor, delay transfer of
    heat (e.g. wood, wool, air)
  • (Kinesthetic simulation pass the ball)

3
Convection heat transferred by flowing currents
in a fluid (liquid or gas)
  • Hot air rises (becomes less dense) and cools as
    it rises
  • Ex. Hot water heating in a home, air currents by
    lake

4
Examples
Weather
Insulation
Cooking
5
Radiation heat transfer by electromagnetic
waves, heat rays
  • Needs no material medium (goes through a vacuum)
  • e.g Sun, fire, lamp filament

6
Radiation
7
Summary
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