@article{JRC13549, address = {}, year = {1997}, author = {De Bievre P and Peiser HS}, abstract = {In contrast with some other factors that relate SI quantities, those involving amount of substance vary by entity in their magnetude and their uncertainty. The mole-to-gram factor, called molar mass, like the mole itself, has to be defined by chemical formula, at times also by isotopic composition of constituent elements of a compound in a sample. Chemistry has long dependend greatly on the molar-mass values of the chemical elements in their natural terrestrial occurrence. The determination of these data has called for great skill in chemical analytical methods until isotope-ratio mass spectrometry provided values with smaller uncertainties. The best current knowledge of the set of molar-mass values is published biennally by IUPAC. }, title = {The Reliability of Values of Molar Mass, the Factor that Relates Measurements Expressed in Two SI Base Units (Mass and Amount of Substance).}, type = {}, url = {}, volume = {34}, number = {}, journal = {Metrologia}, pages = {49-59}, issn = {}, publisher = {}, doi = {} }