EUDIOMETER
eudiometer
(noun) measuring instrument consisting of a graduated glass tube for measuring volume changes in chemical reactions between gases
Source: WordNet® 3.1
Etymology
Late 18th century, from Greek: eúdio(s) 'clear, fine', from eu 'well' + dios 'heavenly'
Noun
eudiometer (plural eudiometers)
A graduated glass tube, closed at one end, that is used for measuring the change in the volume of gases during a chemical reaction.
Source: Wiktionary
Eu`di*om"e*ter, n. Etym: [Gr. -meter: cf. F. ediomètre.] (Chem.)
Definition: An instrument for the volumetric measurement of gases; -- so
named because frequently used to determine the purity of the air.
Note: It usually consists of a finely graduated and calibrated glass
tube, open at one end, the bottom; and having near the top a pair of
platinum wires fused in, to allow the passage of an electric spark,
as the process involves the explosion and combustion of one of the
ingredients to be determined. The operation is conducted in a through
of mercury, or sometimes over water. Cf. Burette. Use's ediometer has
the tube bent in the form of the letter. U.
Source: Webster’s Unabridged Dictionary 1913 Edition