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igcse physics notesprinted 82 · PDF 82
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printed 82 · PDF 82
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82
Carpet, wooden floor
Convection:
Process in which heat energy transfers with the movement of medium (
liquid and gas). It does not occur in solids.
As shown in the above diagram, during convection, when particles of
liquids or gasses are heated then convectional currents form. In
convectional current particles with high temperature rise due to less density
and cold particles come down due to higher density. Throughout this
process, each and every part of a liquid or gas is heated.
NOTE: BOTH CONDUCTION AND CONVECTION REQUIRE MEDIUM.
Radiation: Process in which heat energy transfers without the aid of any
medium. For example, heat from the sun travels through space.