Century Dictionary and Cyclopedia
- n. An instrument originally designed for ascertaining the purity of the air or the quantity of oxygen it contains, but now generally employed in the analysis of gases, for the determination of the nature and proportion of the constituents of any gaseous mixture. One form consists of a graduated glass tube, either straight or bent in the shape of the letter U, hermetically sealed at one end and open at the other. Two platinum wires, intended for the conveyance of electric sparks through any mixture of gases, so as to cause the union of certain of them, are inserted through the glass near the shut end of the tube, and closely approach but do not touch each other. The nature and proportions of the constituents of the gaseous mixture are determined by the diminution in volume after the passing of the spark.
- n. A graduated glass tube closed at one end that is used for measuring the change in the volume of gases during a chemical reaction.
GNU Webster's 1913
- n. (Chem.) An instrument for the volumetric measurement of gases; -- so named because frequently used to determine the purity of the air.
- n. measuring instrument consisting of a graduated glass tube for measuring volume changes in chemical reactions between gases
- Late 18th century, from Greek: eúdio(s) 'clear, fine', from eu 'well' + dios 'heavenly' (Wiktionary)
“He also developed numerous other instruments, including the manometer, cyanometer, diaphonometer, anemometer and mountain eudiometer, the first electrometer (1766), a device for measuring electric potential by means of attraction or repulsion of charged bodies, and the first hygrometer, utilizing a human hair to measure humidity (1783).”
“The eudiometer, a most curious instrument for fixing the purity of air, by measuring the proportion of oxygen, was discovered by”
“N. Teclu has investigated the explosive limits of mixtures of air with certain combustible gases somewhat in the same manner as Eitner, viz.: by firing the mixture in an eudiometer tube by means of an electric spark.”
“The combination of the two gases is brought about in a tube called a eudiometer.”
“~ A form of eudiometer (Fig. 21) different from that shown on page 43 is sometimes used to avoid the calculations necessary in reducing the volumes of the gases to the same conditions of temperature and pressure in order to make comparisons.”
“A mixture of 50 cc. of carbon monoxide and 50 cc. of oxygen was exploded in a eudiometer, (a) What gases remained in the tube after the explosion?”
“~ When the quantitative synthesis of water is carried out in the eudiometer as described above, the water vapor formed by the union of the hydrogen and oxygen at once condenses.”
“~ If the two gases are introduced into the eudiometer in the exact proportions in which they combine, after the combination has taken place the liquid will rise and completely fill the tube.”
“This can be accomplished by surrounding the arm A of the eudiometer”
“A eudiometer tube is filled with mercury and inverted in a vessel of the same liquid.”
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