title: The density of 4-aminopyridine, voids in crystals, and precision weighing.
abstract: Erratic results in the determination of the density of 4-aminopyridine have been traced to numerous tubular cavities, some traversing the entire length of the long, thin crystals formed by sublimation. The effect of the variability in density, as it affects the correction for the buoyancy of air in a high-precision weighing, is discussed with particular reference to the value of the Faraday.
authors.affiliation: Departments of Chemistry and Earth Sciences, Iowa State University, Ames, IA 50011, U.S.A.
authors.forename: H
authors.initials: H
authors.lastname: Diehl
authors.forename: D L
authors.initials: DL
authors.lastname: Biggs