Elements of chemistry : including the applications of the science in the arts . burns when kindled in the air with ayellow flame of little intensity, which moistens a dry glass jar held over it; the gascombining with the oxygen of the air in burning, and producing water. If beforebeing kindled the gas is first mixed with enough of air to burn it completely, orwith between two and three times its volume, and then kindled, the combustion ofthe whole hydrogen is instantaneous and attended with explosion. With pure oxygen,instead of air, the explosion is much more violent, particularly when the ga
Elements of chemistry : including the applications of the science in the arts . burns when kindled in the air with ayellow flame of little intensity, which moistens a dry glass jar held over it; the gascombining with the oxygen of the air in burning, and producing water. If beforebeing kindled the gas is first mixed with enough of air to burn it completely, orwith between two and three times its volume, and then kindled, the combustion ofthe whole hydrogen is instantaneous and attended with explosion. With pure oxygen,instead of air, the explosion is much more violent, particularly when the gases aremixed in the proportions of two volumes of hydrogen to one of oxygen, which arethe proper quantities for combination. The combustion is not thus propagatedthrough a mixture of these gases, when either of them is in great excess. Thesound in such detonations is occasioned by the concussion which the atmosphere re-ceives from the sudden dilatation of gaseous matter, in this case of steam, which isprodigiously expanded from the heat evolved in its formation. HYDROGEN 235. A musical note may be produced by means of these detonations,when they are made to succeed each other very rapidly. If hydro-gen be generated in a gas-bottle (fig. 104), and kindled as itescapes from an upright glass jet having a small aperture, the gaswill be found to burn tranquilly; but on holding an open glasstube of about two feet in length over the jet, like a chimney, theflame will be_ elongated and become flickering. A succession oflittle detonations is produced, from the gas being carried up andmixing with the air of the tube, which follow each other soquickly as to produce a continuous sound or musical note. Several circumstances affect the combination of hydron-en withoxygen, which are important. These gases may be mixedlogetherin a glass vessel, and preserved for any length of time withoutcombining. But combination is instantly determined by flame, bypassing the electric spark through the mixtu
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