Pyrotechnics Practice Exam

Heat transfer through space from one object to another without touching is radiation. It uses electromagnetic waves to carry energy, so no medium or contact is needed—like the Sun’s warmth reaching Earth through the vacuum of space. Conduction requires direct contact for energy to pass between touching substances, and convection relies on the bulk movement of a fluid carrying heat. Transmission isn’t the term used for this mode of heat transfer across empty space. So radiation is the correct mechanism.