Terms sourced from: https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf
"IUPAC Quantities, Units and Symbols in Physical Chemistry", , 1993,
α-particle absolute activity \(\lambda\)absorbance \(A\)absorptance \(\alpha\)absorption coefficient absorption cross-section \(\sigma\)absorption factor absorption intensity acceleration \(a\)activation energy activity activity \(A\)activity \(a\)advancement affinity of reaction \(A\)amount concentration \(c\)amount fraction x (y for gaseous mixtures) amount of substance \(n\)amount-of-substance concentration amount-of-substance fraction \(x\)ampere \(\text{A}\)angle angle of optical rotation \(\alpha\)angular frequency \(\omega\)angular momentum \(L\)anode atmosphere atomic mass \(m_{\text{a}}\)atomic number \(Z\)atomic orbital \(\psi\),\(\varphi\),\(\chi\)atomic weight attenuance \(D\)attenuation coefficient atto