Convection
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Convection is the transfer of heat through the physical movement of fluids, where warmer, less-dense material rises and cooler, denser material sinks.
Thermal image of a newly lit Ghillie kettle. The plume of hot air resulting from the convection current is visible.
Painting of William Prout
Fireplace, with grate and chimney
This color schlieren image reveals thermal convection originating from heat conduction from a human hand (in silhouette) to the surrounding still atmosphere, initially by diffusion from the hand to the surrounding air, and subsequently also as advection as the heat causes the air to start to move upwards.
Advection
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In the fields of physics, engineering, and earth sciences, advection is the transport of a substance or quantity by bulk motion of a fluid. The properties of that substance are carried with it. Genera
Convection
…current flows nor significant diffusion of matter can take place. Granular convection is a similar phenomenon in granular material instead of fluids. Advection is the transport of any substance or quantity (such as heat) through fluid motion. Convection is a process involving bulk movement of a fluid that…
The four fundamental modes of heat transfer illustrated with a campfire