Q
QuestionChemistry

What units is absorbance measured in?
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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.