Density of Sodium Chloride The Atomic Weight of Fluorine by Combination of Crystal Density and X-Ray Data

Abstract

The densities of carefully purified crystals of sodium chloride have been determined by the method of "crystal flotation" in pure ethylene dibromide. The results yield $d_{27.634°\mathrm{C}}=2.16165\mathrm{}\pm 0.00002\frac{\mathrm{g}}{\mathrm{ml}},$ which reduces to $d_{20°}=2.16366\mathrm{}\pm 0.00003\frac{\mathrm{g}}{\mathrm{ml}}.$