Covection is a method of transfer of heat from one region to another. It occurs in fluids ( liquids and gases) but not in solids. It involves the actual movement of the fluid molecules in the form of kinetic energy such that as one molecule hits the other, the kinetic energy is transferred thereby transferring the heat.
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Convection waves are invisible: You can't see them.
A convection cell churning near mid-ocean ridges.
In convection less molecules occupy large volume as in air to reduce the density.
Radiation
Hi! Basically convection is the transfer of thermal energy through fluids. Examples would be air and water.