# Absorbance

the capacity of a substance to absorb radiation, expressed as the common logarithm of the reciprocal of the transmittance of the substance.

**noun**

(physics) a measure of the light-absorbing ability of an object, expressed as the logarithm to base 10 of the reciprocal of the internal transmittance See transmittance

absorbance ab·sorb·ance (əb-sôr’bəns, -zôr’-) or ab·sorb·an·cy or ab·sorb·en·cy (əb-sôr’bən-sē, -zôr’-)

n.

Abbr. A In spectrophotometry, equal to 2 minus the log of the percentage transmittance of light. Also called extinction, optical density.

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the capacity of a substance to absorb radiation, expressed as the common logarithm of the reciprocal of the transmittance of the substance. noun (physics) a measure of the light-absorbing ability of an object, expressed as the logarithm to base 10 of the reciprocal of the internal transmittance See transmittance absorbance ab·sorb·ance (əb-sôr’bəns, -zôr’-) or ab·sorb·an·cy […]

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