Sustainable Living: 3M FuturewiseTown PlanIntroductionGo BackGo Next: Convection currents3M


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Convection is a method of heat transfer
that only happens in liquids and gases.

It cannot happen in solids. If you heat a liquid or a gas, the particles in it move faster and this makes them spread out.

Because the particles are spread out
there are fewer particles in a volume
(e.g. a cubic centimetre).

Because there are fewer particles in
each cube of the liquid or gas, the cube
is lighter (the warmer the gas or liquid,
the less dense it is). The lighter cube (the less dense gas
or liquid) rises up and denser, cooler gas or liquid takes its place.

I'm ready to see convection currents