absorbance
(əbs-, əbˈzɔːbəns)
[f. absorb v. + -ance.]
The logarithm of the ratio of the luminous flux entering a sample or object to that transmitted by it; = optical density s.v. optical a. 2 a.
| 1947 Nat. Bureau Standards Let. Circular No. 857. 4 Those in the Bureau most concerned with the matter have formulated the terminology given below... Ai = - log10 Ti = log10 1/Ti = log10 I0/I = absorbance of the sample. 1971 Nature 4 June p. x/1 (Advt.), A high performance double-beam instrument designed for linear transmittance and linear absorbance measurements in the 190–800 nm wavelength range providing a resolution of 0·2 nm. 1978 Ibid. 3 Aug. 447/2 (caption) Ordinate: optical absorbance was taken as a measure of cell dissociation. 1982 SynFuels 15 Oct. 6 The HPLC apparatus consists of two dual-piston pumps, an injection valve, a chromatographic column, and an ultraviolet (UV) absorbance detector. |