Emissivity: Difference between revisions
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Emissivity is a term in [[radiometry]]. It is the ratio between the observed [[Irradiance|exitance]] and ideal [[Black-body_radiation|blackbody exitance]]: | '''Emissivity''' is a term in [[radiometry]]. It is the ratio between the observed [[Irradiance|exitance]] and ideal [[Black-body_radiation|blackbody exitance]]: | ||
<math> | <math> | ||
Revision as of 21:26, 2 January 2008
Emissivity is a term in radiometry. It is the ratio between the observed exitance and ideal blackbody exitance:
Note that emissivity is a unitless quantity in the range [0,1]. It normally varies as a function of wavelength. Objects with a uniform emissivity are often called gray bodies.