Quantities (A)
absolute activity \(\lambda\)absolute lethal concentration \(\text{LC}_{100}\)absolute lethal dose \(\text{LD}_{100}\)absorbance \(A\)absorbed (spectral) photon flux density absorbed (spectral) radiant power density absorptance \(\alpha\)absorption cross-section \(\sigma\)acceleration of free fall \(g\)acceleration \(a\)acceptable daily intake acceptor number \(\text{AN}\)actinic flux \(S_{\lambda}\)activation energy activity \(a\)activity coefficient \(f\),\(\gamma \)activity \(A\)affinity of reaction \(A\)amount concentration \(c\)amount fraction x (y for gaseous mixtures) amount of substance \(n\)angle angle of optical rotation \(\alpha\)angular frequency \(\omega\)angular momentum \(L\)atomic mass \(m_{\text{a}}\)atomic number \(Z\)attenuance \(D\)