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Qu'est-ce (qui) est émittance - définition
WIKIMEDIA DISAMBIGUATION PAGE
Emittance (disambiguation)
Emissivity
![A typical spectrum of Earth's total outgoing (upwelling) thermal radiation flux under clear-sky conditions, as simulated with [[MODTRAN]]. [[Planck curve]]s are also shown for a range of Earth temperatures.](https://commons.wikimedia.org/wiki/Special:FilePath/IR emission in current greenhouse levels.png?width=200 "A typical spectrum of Earth's total outgoing (upwelling) thermal radiation flux under clear-sky conditions, as simulated with [[MODTRAN]]. [[Planck curve]]s are also shown for a range of Earth temperatures.")
EFFECTIVENESS OF AN OBJECT IN EMITTING THERMAL RADIATION
Thermal emissivity; Greybody; Nonselective radiator
·add. ·noun Tendency to emission; comparative facility of emission, or rate at which emission takes place;.
II. Emissivity ·noun Tendency to emission; comparative facility of emission, or rate at which emission takes place, as of heat from the surface of a heated body.
III. Emissivity ·add. ·noun the rate of emission of heat from a bounding surface per degree of temperature difference between the surface and surrounding substances (called by Fourier external conductivity).
Thermal emittance
Emittivity
Thermal emittance or thermal emissivity (\varepsilon) is the ratio of the radiant emittance of heat of a specific object or surface to that of a standard black body. Emissivity and emittivity are both dimensionless quantities given in the range of 0 to 1, representing the comparative/relative emittance with respect to a blackbody operating in similar conditions, but emissivity refers to a material property (of a homogeneous material), while emittivity refers to specific samples or objects.
Radiant exitance
AREAL DENSITY OF EXITING RADIANT FLUX
Radiant emittance; Exitance; Spectral radiant exitance; Photon exitance
In radiometry, radiant exitance or radiant emittance is the radiant flux emitted by a surface per unit area, whereas spectral exitance or spectral emittance is the radiant exitance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength. This is the emitted component of radiosity.
Wikipédia
Emittance
Emittance may refer to:
- Beam emittance, the area occupied by a beam in a position-and-momentum phase space
- Radiant emittance, the radiant flux emitted by a surface per unit area
- Thermal emittance, emissivity of a surface
