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'''Radiant heat''' is [[sunlight]] falling on the surface of a [[planet]] is primarily in the visible part of the [[spectrum]]. However, the [[reflection]] of [[light]] from the surface tends to produce light of longer [[wavelength]] called [[infrared]] (IR) radiation (also known as radiant heat; IR radiation is the [[heat]] that we sense being radiated from a hot surface like a hot piece of metal).
'''Radiant heat''' is [[heat]] in the form of [[light]], normally in the [[infrared]] part of the electromagnetic spectrum. Unlike conduction and [[convection]], radiation does not require a [[medium]] to pass through.
One example is sunlight being absorbed by the surface of the [[earth]]. However, the [[reflection]] of [[light]] from the surface tends to produce light of longer [[wavelength]] called [[infrared]] (IR) radiation. IR radiation is also radiated from a hot surface like a hot piece of metal.
==Mathematics==
For a black body, the heat current radiated off it, <math>H</math> may be described as:
<math>H = Ae \sigma T^4</math>
where
:<math>A</math> is the [[area]] of the body
:<math>e</math> is it's emissivity
:<math> \sigma</math> is the Stefan-Boltzmann constant
:<math> T</math> is the [[temperature]] of the body
==See Also==
*[[Convection]]
==Links==
==Links==
*[http://csep10.phys.utk.edu/astr161/lect/venus/greenhouse.html Astronomy 161 at University of Tennessee]
*[http://csep10.phys.utk.edu/astr161/lect/venus/greenhouse.html Astronomy 161 at University of Tennessee]
[[Category:Astronomy]]
[[Category:Physics]]
[[Category:Thermodynamics]]
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