Difference between revisions of "Radiant heat"
Jump to navigation
Jump to search
GregLarson (talk | contribs) m (categorize) |
(username removed) (Added some stuff) |
||
| Line 1: | Line 1: | ||
| − | '''Radiant heat''' is [[ | + | '''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: | + | [[Category:Physics]] |
| + | [[Category:Thermodynamics]] | ||
Revision as of 15:04, September 24, 2016
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, may be described as:
where
- is the area of the body
- is it's emissivity
- is the Stefan-Boltzmann constant
- is the temperature of the body
