Pycnometer


Pycnometer

The pycnometer (from Greek: πυκνός (puknos) meaning "dense"), also called pyknometer or specific gravity bottle, is a flask, usually made of glass, with a close-fitting ground glass stopper with a capillary tube through it, so that air bubbles may escape from the apparatus. This enables the density of a fluid to be measured accurately, by reference to an appropriate working fluid such as water or mercury, using an analytical balance.

If the flask is weighed empty, full of water, and full of a liquid whose specific gravity is desired, the specific gravity of the liquid can easily be calculated. The particle density of a powder, to which the usual method of weighing cannot be applied, can also be determined with a pycnometer. The powder is added to the pycnometer, which is then weighed, giving the weight of the powder sample. The pycnometer is then filled with a liquid of known density, in which the powder is completely insoluble. The weight of the displaced liquid can then be determined, and hence the specific gravity of the powder.

The pycnometer is used in ISO standard: ISO 1183-1:2004, and ASTM standard: ASTM D854.


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  • Pycnometer — Pyc*nom e*ter, n. [Gr. ? dense, compact + meter.] (Physics) A specific gravity bottle; a standard flask for measuring and comparing the densities of liquids. [Also written {pyknometer}.] [1913 Webster] …   The Collaborative International Dictionary of English

  • pycnometer — [pik näm′ət ər] n. [ PYCNO + METER] a vessel of a precise volume used to measure the density of liquids or solids …   English World dictionary

  • pycnometer — piknometras statusas T sritis Standartizacija ir metrologija apibrėžtis Specialios formos ir tam tikro tūrio stiklinis indas skysčių (žr. areopiknometras) ir kietųjų medžiagų tankiui matuoti. atitikmenys: angl. density bottle; pycnometer vok.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • pycnometer — piknometras statusas T sritis chemija apibrėžtis Laboratorinis indas medžiagų tankiui matuoti. atitikmenys: angl. density bottle; pycnometer rus. пикнометр …   Chemijos terminų aiškinamasis žodynas

  • pycnometer — piknometras statusas T sritis fizika atitikmenys: angl. pycnometer; pyknometer vok. Pyknometer, n rus. пикнометр, m pranc. picnomètre, m; pycnomètre, m …   Fizikos terminų žodynas

  • pycnometer — noun Etymology: Greek pyknos + International Scientific Vocabulary meter Date: 1858 a standard vessel often provided with a thermometer for measuring and comparing the densities of liquids or solids …   New Collegiate Dictionary

  • pycnometer — /pik nom i teuhr/, n. a container used for determining the density of a liquid or powder, having a specific volume and often provided with a thermometer to indicate the temperature of the contained substance. [1880 85; PYCNO + METER] * * * …   Universalium

  • pycnometer — noun a vessel used to determine the specific gravity of a liquid; a specific gravity bottle See Also: pycnometric, pycnometry …   Wiktionary

  • Pycnometer — Пикнометр, прибор для измерения плотности (напр. печатных красок) …   Краткий толковый словарь по полиграфии

  • pycnometer — pyc·nom·e·ter or pyk·nom·e·ter pik näm ət ər n a standard vessel often provided with a thermometer for measuring and comparing the densities or specific gravities of liquids or solids pyc·no·met·ric or pyk·no·met·ric .pik nə me trik adj… …   Medical dictionary