Radiation 1) Emission or transfer of energy in the form of electromagnetic waves. 2) The process by which electromagnetic radiation is propagated through free space by virtue of joint undulatory variations in the electric and magnetic fields in space. This concept is to be distinguished from conduction and convection.
Energy transported through electromagnetic waves. These waves do not need molecules to propagate them, and in a vacuum they travel at nearly 300,000 kilometers per second. See shortwave radiation and longwave radiation.
Energy emitted in the form of electromagnetic waves. Radiation has differing characteristics depending upon the wavelength. Because the radiation from the Sun is relatively energetic, it has a short wavelength (ultra-violet, visible, and near infrared) while energy radiated from the Earth's surface and the atmosphere has a longer wavelength (e.g., infrared radiation) because the Earth is cooler than the Sun. See ultraviolet radiation, infrared radiation, solar radiation, longwave radiation, terrestrial radiation.
- Browse Related Terms: Atmospheric Radiation, atmospheric window, Infrared radiation, longwave radiance, Longwave Radiation, microwave radiation, Photovoltaic and solar thermal energy, radiation, Shortwave Radiation, Shortwave Trough, Solar Radiation, surface skin temperature, Terrestrial radiation, ultraviolet radiation, Visible Light
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