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Exitance vs Extance - What's the difference?

exitance | extance |

As nouns the difference between exitance and extance

is that exitance is (physics) flux (of radiation) while extance is (obsolete|rare) emergence.

exitance

English

Noun

(en noun)
  • (physics) Flux (of radiation).
  • * 1984-7 , John E. Kaufman, Jack F. Christensen, (Illuminating Engineering Society of North America), IES lighting handbook: Volume 1984 :
    • The entire east sky provided an equivalent exitance of 19 kilolumens per square meter (Method 1)
  • * 1998 , Glenn D. Boreman, Basic electro-optics for electrical engineers , page 49:
    • 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:
  • * 1999 , Joseph Caniou, Passive infrared detection: theory and applications , page 42:
    • In practice, unless otherwise indicated, it is accepted that exitance is taken to be a hemispherical quantity.
  • * 2006 , Craig M. Payne, Principles of Naval Weapon Systems , page 104:
    • 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.

    extance

    English

    Noun

    (en noun)
  • (obsolete, rare) emergence
  • * 1682 , Sir Thomas Browne, Christian Morals
    • He who hath in his intellect the ideal existences of things and entities before their extances .

    References

    * OED