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The law states that there is a logarithmic dependence
between the transmission T of light through a substance,
the
product
substance α, and the distance the light travels through
the material l.
For liquids, these relations are usually written as:
I
-∝l
T =
= 10
I
0
Where: I
and I are the intensity of the incident light and
0
the transmitted light, respectively.
The transmission (or transmittance) is expressed in
terms of absorbance which, for liquids, is defined as:
�
I
A = -log
10
I
0
This implies that the absorbance becomes linear with
the concentration (or number density of absorbers)
according to:
A = αl
V2018.01
of
the absorption
� = -log
(T)
10
25
coefficient of
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