Thermal radiation

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Thermal radiation

Thermal radiation (pronounced: /ˈθəːm(ə)l ˌreɪdɪˈeɪʃ(ə)n/) is a type of electromagnetic radiation that involves the emission of energy from the surface of an object due to its temperature.

Etymology

The term "thermal radiation" is derived from the Greek word "therme" meaning heat, and the Latin word "radiatio" meaning shining, sending out rays.

Definition

Thermal radiation is a process by which the surface of an object emits its excess energy in the form of electromagnetic waves. The energy emitted is directly proportional to the fourth power of the object's absolute temperature, as stated in the Stefan-Boltzmann law.

Related Terms

  • Black body radiation: The type of electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, or emitted by a black body held at constant, uniform temperature.
  • Infrared radiation: A type of electromagnetic radiation with wavelengths longer than those of visible light, but shorter than those of radio waves. It is a form of thermal radiation.
  • Stefan-Boltzmann law: A law that describes how the total energy radiated per unit surface area of a black body is directly proportional to the fourth power of the black body's temperature.
  • Electromagnetic spectrum: The range of all possible frequencies of electromagnetic radiation.

See Also

External links

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