the movement caused within a fluid by the tendency of hotter
like boiling water
what is convection
the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
like if... well... umm... like radiation ?
what is radiation
the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.