Discussion
The negative logarithm of transmittance is called ______.
Answer: A
This is absorbance, sometimes called optical density in older writing. Extinction is an older term for the same idea and for the absorptivity coefficient, which is part of why it fell out of use; turbidity describes scattering by suspended matter; and reflectance is the fraction returned from a surface. The quantity is defined logarithmically for one reason alone, which is that it is then proportional to concentration. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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