Accurate measuring of the density of solids, using helium as a gaseous medium

For an investigation of chemical and physical properties of matter density can be a valuable expedient. Up to now methods for the determination of the density of solids, e.g. powders, generally give an accuracy not better than ±5‰ In this paper an apparatus is described allowing to determine the density of solids with an accuracy of at least ±0.2‰