Science / Chemistry / Iupac: International Union of Pure and Applied Chemistry, an organization which sets international standards for chemical nomenclature, atomic weights, and the names of newly discovered elements.
Science / Biology / Atomic Weight: The sum of the weights of an atoms protons and neutrons, the atomic weight differs between isotopes of the same element. MORE
Science / Chemistry / Limit Of Quantitation: The smallest detectable concentration an analytical instrument can determine at a given confidence level. IUPAC defines the quantitative detection limit as Cld = ks/m, where k is 10, s is the standard MORE