Pychnometer
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helium pycnometer
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A helium pycnometer is a laboratory device used for measuring the density or more accurately the volume of solids, be they regularly shaped, porous or non-porous, monolithic, powdered, granular or in some way comminuted, employing some method of gas displacement[1][2][3] and the volume:pressure relationship known as Boyle's Law.
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Pycnometer Bottle
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Pycnometer Bottle, Tribrach Adapter With Optical Plummet