https://doi.org/10.1351/goldbook.A00028
Logarithm of the ratio of incident to transmitted @[email protected] through a sample (excluding the effects on cell walls). Depending on the base of the logarithm a decadic and Napierian absorbance are used. Symbols: \(A\), \(A_{10}\), \(A_\text{e}\). This quantity is sometimes called @[email protected], although the term @[email protected], better called @[email protected], is reserved for the quantity which takes into account the effects of @[email protected] and @[email protected] as well.