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# Aerometer

An aerometer is a scientific instrument used to measure the weight and density of a gas or liquid. It is a hollow tube, widened at the bottom where a weight is placed (B). A scale is present on the upper part of the rod. The aerometer is placed in the liquid needing to be tested. The scale (A) will be held upright by the weight in the lower part (B). The density of the liquid is read where the scale penetrates the surface of the liquid.

It was originally created by Abū Rayhān al-Bīrūnī in the 11th century and described by Al-Khazini in the 12th century. [Mariam Rozhanskaya and I. S. Levinova (1996), "Statics", p. 639, in Harvard reference |last1=Rashed |first1=Roshdi |last2=Morelon |first2=Régis |year=1996 |title=Encyclopedia of the History of Arabic Science |volume=1 & 3 |publisher=Routledge |isbn=0415124107 |pages=614-642] It later appeared again in the work of Jacques Alexandre César Charles in the 18th century.

Scope of use

Different solutes may add or subtract density, as the density of a liquid is only partly determined by the density of the solvent, so the aerometer is of no use in determining the nature of an unknown liquid. The apparatus can monitor a process or estimate a concentration of solutes. For example, one can determine the alcohol contents of a beverage after distillation by using the aerometer.

Principle

The aerometer is an example of the law of Archimedes: the upward force by a liquid equals the mass of the displaced liquid. The weight of the aerometer is fixed; the deeper the meter sinks in the liquid, the more it is replaced. The aerometer floats when equilibrium is reached.

References

Wikimedia Foundation. 2010.

### Look at other dictionaries:

• Aerometer — A [ e]r*om e*ter, n. [A[ e]ro + meter: cf. F. [ e]rom[ e]tre.] An instrument for ascertaining the weight or density of air and gases. [1913 Webster] …   The Collaborative International Dictionary of English

• Aërometer — (v. gr.), Luftmesser, Instrument zur Bestimmung der Bestandtheile u. des specifischen Gewichts einer elastischen Flüssigkeit, z.B. der atmosphärischen Luft; hierher gehören das Baro Hygro , Thermometer u. a. Daher Aëromelrir, Luftmeßkunst, die… …   Pierer's Universal-Lexikon

• Aërometer — Aërometer, Luftmesser, Instrument zur Bestimmung des specifischen Gewichts einer Luftart; daher Aërometrie die Wissenschaft von dem Gleichgewicht und der Bewegung d. Luftarten …   Herders Conversations-Lexikon

• aerometer — [er äm′ət ər] n. an instrument for measuring the weight and density of air or other gases aerometric [er΄ō me′trik] adj. aerometry [er äm′ə trē] n …   English World dictionary

• Aerometer — Als Aerometer (oder Ärometer, von gr. aero Gas, Luft und metron Maß) werden verschiedene Vorrichtungen zur Charakterisierung oder Handhabung von Gasen bezeichnet. Sofern mit dem Begriff Messgeräte bezeichnet werden, können mit diesen die Dichte,… …   Deutsch Wikipedia

• Aerometer — aerometras statusas T sritis Standartizacija ir metrologija apibrėžtis Dujų masės ir tankio matuoklis. atitikmenys: angl. aerometer vok. Aerometer, n; Luftdichtigkeitsmesser, m rus. аэрометр, m pranc. aéromètre, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• aerometer — aerometras statusas T sritis chemija apibrėžtis Dujų masės ir tankio matuoklis. atitikmenys: angl. aerometer rus. аэрометр …   Chemijos terminų aiškinamasis žodynas

• aerometer — noun Etymology: probably from French aéromètre, from aér + mètre meter Date: 1794 an instrument for ascertaining the weight or density of air or other gases …   New Collegiate Dictionary

• aerometer — aerometric /air euh me trik/, adj. aerometry /air rom i tree/, n. /air rom i teuhr/, n. an instrument for determining the weight, density, etc., of air or other gases. [1785 95; AERO + METER] * * * …   Universalium

• aerometer — noun An instrument used to measure the mass and density of gases …   Wiktionary