Abstract
The design and use of a differential volumenometer for measuring volume changes of solid samples to ±5 parts per million are described. The sample, sealed in a reservoir with only a capillary outlet, is covered with mercury, in which it must not be soluble. Any alteration in the sample volume, such as might be produced by heating it while in the volumenometer, is detected as a change in the level of the mercury meniscus in the capillary. Measurements of this level are made while the volumenometer is held at a standard temperature. The volumenometer may be heated to at least 250° C to produce changes in a sample. During the heating of volumenometers containing metal samples, small amounts of gas have been observed to evolve under the mercury. This affects the measurements, and a procedure is described for removing such gas from the volumenometer. Data on the volume changes occurring during the annealing of cold-worked titanium in stages between 25° and 250° C are presented as an example of the application of this instrument.
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