absorptancen.

Brit.

/abˈzɔːpt(ə)ns/,

/abˈsɔːpt(ə)ns/, U.S.

/æbˈzɔrptns/,

/əbˈzɔrptns/,

/æbˈsɔrptns/,

/əbˈsɔrptns/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin absorpt- , absorbēre , -ance suffix.

Etymology: < classical Latin absorpt-, past participial stem of absorbēre absorb v. + -ance suffix, probably after reflectance n. Compare earlier absorbance n.

Physics.

A measure of the degree to which a substance or object absorbs radiation incident on it, equal to the ratio of the absorbed to the incident flux.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > heat > [noun] > absorption

absorption factor1868

absorptance1922

1922 L. F. Richardson Weather Predict. Numerical Process iv. 52 The quantity η may be called the ‘absorptance’ of the stratum for rays in the direction ζ.

1937 W. E. Forsythe Measurem. Radiant Energy i. 23 If ϕ is the incident radiant flux, ϕ = ρϕ + αϕ or 1 = ρ + α where ρ is the reflectivity and α the absorptance of the material.

1978 Nature 14 Sept. 95/2 Proprietary coatings include various Ni/Cr oxides/sulphides, which can have solar absorptances of up to 0.98 and infrared emittances of less than 0.2.

2004 Amer. Jrnl. Bot. 91 1999/2 Absorptance values were compared between leaf surfaces and reflected light environments.

This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).

单词	absorptance
释义	absorptancen. Brit. /abˈzɔːpt(ə)ns/, /abˈsɔːpt(ə)ns/, U.S. /æbˈzɔrptns/, /əbˈzɔrptns/, /æbˈsɔrptns/, /əbˈsɔrptns/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin absorpt- , absorbēre , -ance suffix. Etymology: < classical Latin absorpt-, past participial stem of absorbēre absorb v. + -ance suffix, probably after reflectance n. Compare earlier absorbance n. Physics. A measure of the degree to which a substance or object absorbs radiation incident on it, equal to the ratio of the absorbed to the incident flux. ΘΚΠ the world > matter > physics > electromagnetic radiation > heat > [noun] > absorption absorption factor1868 absorptance1922 1922 L. F. Richardson Weather Predict. Numerical Process iv. 52 The quantity η may be called the ‘absorptance’ of the stratum for rays in the direction ζ. 1937 W. E. Forsythe Measurem. Radiant Energy i. 23 If ϕ is the incident radiant flux, ϕ = ρϕ + αϕ or 1 = ρ + α where ρ is the reflectivity and α the absorptance of the material. 1978 Nature 14 Sept. 95/2 Proprietary coatings include various Ni/Cr oxides/sulphides, which can have solar absorptances of up to 0.98 and infrared emittances of less than 0.2. 2004 Amer. Jrnl. Bot. 91 1999/2 Absorptance values were compared between leaf surfaces and reflected light environments. This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021). < n.1922
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