Null-Point Torsion Effusion Apparatus

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Abstract
A null‐point apparatus, capable of manual or automatic operation, for determining vapor pressures by the torsion effusion method is described. Vapor pressure measurements in the range 10−6 to 10−2 mm Hg can be determined with an accuracy of ±1%. The sensitivity is constant over the entire pressure range and is influenced only by the choice of a suitable torsion wire.