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Energy Transfer

Heat - Convection.

Heat can be transferred by convection in liquids and gases.
Particles in the liquid or gas collide with a substance
which has a high temperature and gain kinetic energy (heat).
The particles move to a region which has substance at a lower temperature
and transfer heat by colliding with the colder substance.
In this way, the high temperature substance
has heat taken away from it and gets colder.
The low temperature substance has heat given to it and gets warmer.

The liquid or gas which transfers the heat
can circulate round and round between the hot and cold regions.
The flow of liquid or gas is called a convection current.
Convection currents are caused by changes in density (continued).

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