What is the process called that involves the transfer of heat through the emission of energy in the form of invisible waves?

The process that involves the transfer of heat through the emission of energy in the form of invisible waves is known as radiation. This phenomenon occurs when heat energy is emitted from a source in the form of electromagnetic waves, which can travel through a vacuum without the need for a medium. For example, the heat from the sun reaches the Earth through radiation, as it travels across the vacuum of space.

In contrast to conduction, which involves heat transfer through direct contact between materials, and convection, which involves the movement of fluids (liquids or gases) transferring heat as they circulate, radiation is unique in that it does not require direct contact or a medium to facilitate the heat transfer. The concept of dispersion is unrelated to thermal energy transfer. Understanding radiation is crucial for fire fighters, especially when dealing with heat sources and assessing fire behavior, as it plays a significant role in the spread of fire and heat.