I assume you mean "convection". The hotter liquid or gas is less dense, so it has less weight per unit volume, and it tends to float (move upward).
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Archimedes Principal is the principal for buoyancy
Archimedes studied astronomy, engineering, mathematics, and war tactics.
"Eureka!" (I have found it!) - his shout after discovering of so called Archimedes' Principle.
Archimedes is especially important for his discovery of the relation between the surface and volume of a sphere and its circumscribing cyclinder. He is known for his formulation of a hydrostatic principle (known as Archimedes' principle) and a device for raising water, still used in developing countries, known as the Archimedes screw.
Not at all. Maybe you mean Archimedes?