<span>Radiation is the transfer of heat regardless of the presence of atoms or particles. </span>There are three types of heat transfer or heat propagation; conduction, convection and radiation. Heat transfer is the process by which heat projects externally however, depending on the temperature and pressure. Also called the movement of heat from a low temperatured state which increases as heat progresses. Conduction is the heat transfer by contact, immediate contact. <span>Convection is the transfer of heat through air and water.</span>
