exitance - определение. Что такое exitance
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Что (кто) такое exitance - определение

AREAL DENSITY OF EXITING RADIANT FLUX
Radiant emittance; Exitance; Spectral radiant exitance; Photon exitance

Radiant 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.
Illuminance         
LUMINOUS FLUX INCIDENT ON A SURFACE PER AREA
Luminous emittance; Luminous exitance; Luminous density
In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception.
exit         
WIKIMEDIA DISAMBIGUATION PAGE
EXIT; Exit (album); Exit (disambiguation); Exit (TV series); Exit (song); Exits; Exit (film)
exit
(as a stage direction) indicating that a character leaves the stage:
--------
exit
¦ noun
1. a way out of a building, room, or passenger vehicle.
a place for traffic to leave a major road or roundabout.
2. an act of leaving; a departure.
3. literary a person's death.
¦ verb (exits, exiting, exited)
1. go out of or leave a place.
(exit) (as a stage direction) indicating that a character leaves the stage: exit Pamela.
2. literary die.
3. Computing terminate a process or program.
4. Bridge relinquish the lead.
Origin
C16: from L. exit 'he or she goes out', third person singular pres. tense of exire, from ex- 'out' + ire 'go'.

Википедия

Radiant 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. The SI unit of radiant exitance is the watt per square metre (W/m2), while that of spectral exitance in frequency is the watt per square metre per hertz (W·m−2·Hz−1) and that of spectral exitance in wavelength is the watt per square metre per metre (W·m−3)—commonly the watt per square metre per nanometre (W·m−2·nm−1). The CGS unit erg per square centimeter per second (erg·cm−2·s−1) is often used in astronomy. Radiant exitance is often called "intensity" in branches of physics other than radiometry, but in radiometry this usage leads to confusion with radiant intensity.