reflectance has definitions from the fields of physics,mathematics
[ noun ] (physics,mathematics) the fraction of radiant energy that is reflected from a surface

Used in print

(Jay C. Harris and John R. Van Wazer, "Detergent...)

In this way , numerical values for the relative efficacy of various detergent formulations can be obtained by measuring the reflectance ( whiteness ) of the cloth swatches before and after washing .

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