A Method for Precise Density Determination of Solid by Hydrostatic Weighing

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  • 固体密度の精密測定方法

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Hydrostatic weighing method is often used in the precision measurement of solid density. The accuracy of the measurement is limited by the uncertainty in determining the volume of the solid sample.<br>In this work, a substitution method in balance weighing is introduced in order to eliminate the major sources of error in volumetric measurement. A hydrostatic balance is modified so that the weights can be changed without seperating the knives from the corresponding bearing planes of the balance beam. Also the devices for remote operations and observations are incorporated.<br>The results obtained are as follows:<br>1) The method presented here makes it possible to repeat the volumetric measurement in a short interval without an accurate control of temperature of water and as the result the precision and efficiency of the measurement are greatly improved.<br>2) The change of surface tension on the suspension wire is largely decreased and the reproducibility of the surface tension is estimated to be ±0.04mg with confidence coefficient of 95%.<br>3) By using the value of water density in Chappuis table, the precisions of determining the volume and the density are estimated to be ±7×10-5cm3 and ±4×10-6g/cm3 respectively, with confidence coefficient of 95%, for a weight of 1kg made of stainless steel whose volume is 127cm3.

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