Beam balance buoyancy corrections

This method is smiple but experimentally more cumbersome than the volumetric method and involves the use of a vacuum microbalance or beam balance [22], The solid is suspended from one ann of a balance and its increase in weight when adsorption occurs is measured directly. The dead space calculation is thereby avoided entirely but a buoyancy correction is required to obtain accurate data. Nowadays this method is rarely used. 

Beam vacuum microbalances have greater sensitivity than hdical spring balances and the troublesome buoyancy correction at hi pressure is eliminated, at least partly if not completely. 

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