exitance

plural exitances

1. natural sciencesFlux (of radiation).

   The entire east sky provided an equivalent exitance of 19 kilolumens per square meter (Method 1) […]

   1984-7, John E. Kaufman, Jack F. Christensen, (Illuminating Engineering Society of North America), IES lighting handbook: Volume 1984

   3 more examples

   For a given temperature, exitance is a function of wavelength. This results in a family of spectral exitance curves dependent on temperature. The equation for spectral exitance is the Planck equation: […]

   1998, Glenn D. Boreman, Basic electro-optics for electrical engineers, page 49

   In practice, unless otherwise indicated, it is accepted that exitance is taken to be a hemispherical quantity.

   1999, Joseph Caniou, Passive infrared detection: theory and applications, page 42

   Exitance is the amount of power per unit area expressed in watts per square meter (w/m2), or square centimeter (w/cm2), that leaves a surface and is radiated into a hemisphere.

   2006, Craig M. Payne, Principles of Naval Weapon Systems, page 104