Abstract
The volume or density is one of the very important characteristics for weights. This paper concerns the precise volume measurement of weights. The authors developed a volume measuring apparatus which is based on Boyle's law, and use it as a volume comparator. The volume of weights in a wide mass range can be determined by comparison against a known reference volume. In each comparison, the volumes of the measurement weight and the reference weight are almost equal. The effectiveness of the developed method is verified by a fundamental experiment on weights of 100g to 2kg. For determination of volume of 1kg weights, the expanded uncertainty is evaluated to be 0.048cm3, which is sufficiently applicable to volume measurement of the highest class E1 weights.
