Convection is the concerted, collective movement of groups or aggregates of
molecules within
fluids (e.g.,
liquids,
gases) and
rheids, through
advection or through
diffusion or as a combination of both of them. Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids. Diffusion of heat can take place in solids, but that is called
heat conduction. Convection can be demonstrated by placing a heat source (e.g. a
Bunsen burner) at the side of a glass full of a liquid, and observing the changes in temperature in the glass caused by the warmer ghost fluid moving into cooler areas.