Each artefacts are in contrast in vacuum and in air. By comparing the two artefacts of similar nominal bodyweight, the massive quantity difference displays the air buoyancy and therefore results in a very accurate perseverance of air density. The buoyancy artefacts are mostly useful for the M_one vacuum mass comparator. https://bailingwire79911.wizzardsblog.com/30898667/the-single-best-strategy-to-use-for-bailing-wire