Pysiscs- heat transfer

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Condution is the transfer of thermal enery through a substance without the substance itself moving. Vibrating particles pass on their extra vibration energy to neighbouring particles.  In solids, when one end is heated, the vibrational energy of the moecules increases, and  this energy is transferred from molecule to molecule along the material. All metals are good conductors of heat because some electrons are free to move and can carry energy through the metal quickly. Air and glass are very poor conductors of heat.

(http://www.gcse.com/energy/images/conduction.gif)

Convection is the tansfer of heat energy through fluids (liquids and gases) by the upward movement of warmer, less dense, regions in the fluid. The more energetic particles move from the hotter (less dense) region to…

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