The measurement of small density changes in solids

Abstract

A differential method of measuring small density changes based on Archimedes' principle is described. The necessary temperature conditions are easy to achieve, the method does not depend upon the accurate matching of the mass of a dummy and specimen and is independent of the density of the liquid used. The formula derived is readily evaluated numerically. Using a standard analytical balance, density changes smaller than 1 part in 106 can be detected.