This paper documents the construction details and experimental
procedures for the continuously weighed
pycnometer used in our laboratory to measure fluid properties such as
densities, saturation pressures,
phase boundaries, and isothermal compressibilities. This apparatus
consists of a cell suspended from
an electronic balance at all times and a variable volume bellows cell
which is used to adjust the confined
sample density within an isothermal enclosure. The principal
advantages of this apparatus are rapid
measurement and relatively high accuracy. Some experimental
results are presented to illustrate
capability. The accessible experimental ranges are 100−450 K up
to 200 MPa; measurement accuracy
is 0.1% or better.
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