the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. Credit: Google Baseball swing for example when you swing for power that's convection.
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. Credit: Google A match, for example, is conduction when you light a match.
the emission or transmission of energy in the form of waves or particles through space or through a material medium. Credit: Google Getting warmer by putting your hands over a fire