Radiation 2

Conduction and convection are methods of heat transfer through substances such as vapors, liquids, and solids. On the other hand, Radiation is a heat transfer method that does not involve substances. If something is between a hot item and a cold item, the energy waves from the hot item will be blocked and the heat transfer by radiation will not work effectively. You know that using a parasol on a sunny day can block sunlight and reduce heat transfer.