surface amount, \(n^{\text{s}}\), \(n^{\text{a}}\)
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https://doi.org/10.1351/goldbook.S06156
amount of substance adsorbed on a surface.
Source:
Green Book, 2
nd
ed., p. 63 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)