^ http://purl.obolibrary.org/obo/UO_0000269

"A dimensionless logarithmic unit assigned to a measure of absorbance of light through a partially absorbing substance, defined as -log10(I/I_0) where I = transmitted light and I_0 = incident light." [Wikipedia:http\://en.wikipedia.org/wiki/Absorbance]

absorbance unit

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