Emissivity: Difference between revisions
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imported>Niek Sanders (Defn of emissivity.) |
imported>Mark Widmer (Reworded. Specified that graybody emissivities are less than one.) |
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Emissivity is a term in [[radiometry]]. It is the ratio between the observed exitance and ideal [[Black-body_radiation|blackbody exitance]]: | {{subpages}} | ||
'''Emissivity''' is a term in [[radiometry]]. It is the ratio between the observed [[Irradiance|exitance]] and ideal [[Black-body_radiation|blackbody exitance]]: | |||
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Note that emissivity is a unitless quantity in the range [0,1]. | Note that emissivity is a unitless quantity in the range [0,1]. It normally varies as a function of wavelength. Objects with a wavelength-independent emissivity less than one are often called [[Gray Body|gray bodies]]. | ||
Latest revision as of 18:55, 30 October 2021
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 wavelength-independent emissivity less than one are often called gray bodies.