On a direct method of measuring the coefficient of volume elasticity of metals.

Abstract

For most hard materials the coefficient of volume elasticity is usually calculated from measurements of Young's modulus or of the coefficient of rigidity, either of which, when Poisson's ratio is known, suffices for its determination. Although, however, the total alteration of volume for a given pressure can be calculated from the coefficient thus obtained, it is only for isotropic material that the alteration of dimensions in any given direction can be inferred from.it.