What is meant by Radiation in heat transfer?

Radiation in heat transfer refers to the process of transmitting energy through electromagnetic waves. Unlike conduction and convection, which require a medium (solid or fluid) for heat transfer, radiation can occur through the vacuum of space. This process involves the emission of energy from a hot object and the subsequent absorption by cooler surrounding objects, making it essential in scenarios such as heat from the sun reaching the Earth or the warmth felt from a fire without direct contact. Understanding this concept is crucial in firefighting and safety practices, as it affects how heat is spread in various scenarios, such as in a burning building where heat could radiate to nearby surfaces and materials.