Answer
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Step 1:: Understanding Absorbance
Absorbance is a dimensionless quantity, which means it has no units. It is a measure of the amount of light absorbed by a sample at a specific wavelength.
Step 2:: Definition of Absorbance
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Absorbance (A) is defined by the Beer-Lambert Law as: Where:
Step 3:: Unitless Nature
Because absorbance is calculated as the logarithm of the ratio of light intensities, it is a pure number without any units.
Final Answer
It is a logarithmic ratio of light intensities, which cancels out any units during the calculation.
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