optical depth
natural logarithm of the ratio of incident to transmitted radiant power through a material; the absorbance × ln(10)
en-US/ˈɑptɪkəl ˈdɛpθ/
en-GB/ˈɒptɪkəl ˈdɛpθ/
natural logarithm of the ratio of incident to transmitted radiant power through a material; the absorbance × ln(10)