CONVECTION
Unlike particles of solids, particles in liquids and gases move from one place to another. Take a beaker and put small pieces of paper in it. Fill half of the beaker with water. Heat the beaker by a spirit lamp. We shall see that pieces of paper rise to the top of water, move sideways and sink to the bottom. The water in the beaker also gets warm. The molecules of water absorb heat energy from the bottom of the beaker and rise to the top. Other surrounding molecules of water come to the bottom to absorb heat energy.
The transfer of heat in which molecules of a medium actually move to the source of heat energy to absorb heat and then move away from it, is called convection.
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