Definition: 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
Image: In the summer when you walk on the hot sand the heat transfers to your feet which then makes your feet hot
Definition: The movement caused within a fluid by the tendency of hotter and therefore dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat
Image: Heat moves to the ice from the air. This causes the melting from a solid to liquid
Definition: the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.