Question

• Explain the following items : (1) Absorbance. (2) Transmittance. (3) absorptivity.

Answer 1

(1) Absorbance is the logarithm of the ratio of incident to transmitted radiant power through a sample (excluding the effects on cell walls).

(2) Transmittance is a measure of the amount of light that passes through a transparent material.

(3) absorptivity is a measurement of how strongly a chemical species absorbs light at a given wavelength.