How to measure the isothermal compressibility of liquids accurately

A survey of published data on water and mercury has revealed that conventional methods of measuring compressibility are inaccurate. An analysis of the form of the discrepancies in the data has indicated that anisotropic distortion of the apparatus and air entrainment are the two principal sources of error. Means of eliminating these and other sources of error are described. By utilizing the principles of accurate measurement outlined in this paper, the isothermal compressibility of liquids can be measured several times more accurately than has been achieved before.

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