Glossary: Buoyancy Effect

In the gravimetric method, the change in the measured weight due to the displacement of the gas, following Archimedes’ Principle. This is affected by the sample, the sample holder, and the balance counterweights and hangdowns, and is dependent on the volume and density of these components, and the density of the gas. The sample weight change with pressure in a non-adsorbing gas can also be used for the determination of the sample density. The dead space correction in the volumetric method is the equivalent of the buoyancy effect correction in gravimetry.