Absorbance

absorbance

Used mostly by chemists, the negative logarithm (base 10) of the transmittance of an absorbing sample, often corrected for reflection by its container.

Despite its name, absorbance is a consequence of both scattering and absorption, although scattering is usually assumed to be negligible. To within a constant multiplier, absorbance is absorption optical thickness and depends on the physical thickness of the sample.
Compare absorptance.

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Used mostly by chemists, the negative logarithm (base 10) of the transmittance of an absorbing sample, often corrected for reflection by its container.