Pycnometer definitions

pĭk-nŏm'ĭ-tər
A standard vessel used in measuring the density or specific gravity of materials.
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A vessel of a precise volume used to measure the density of liquids or solids.
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The definition of a pycnometer is a tool used to measure the weight or density of a liquid.

An example of a pycnometer is a scientist's way of figuring out the weight of water.

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(physics) A vessel used to determine the specific gravity of a liquid; a specific gravity bottle.
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Origin of pycnometer

From the Greek: πυκνός (puknos) meaning dense