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Eventually it cools to a point where it begins to fall. Once it is near the source of heat it begins to rise again and takes heat up with it. These cycles are known as convection currents and it is the way by which gases and liquids transfer heat. Convection currents become more efficient when they have a larger volume of air so many insulators work on the principle of restricting the movement of air...

For example cavity wall insulation reduces the space in which air has to move and so reduces the efficiency of convection currents.

Radiation is the way that heat is transferred from a solid to a liquid or gas. It is a mixture of conduction and convection as, like conduction, heat is transferred by contact but then it is also like convection because the heat pushes the molecules away bringing in colder molecules...

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