. Elements of chemistry ... be with two openings,as represented at Fig. the gas burns, the rarefied and vitiated air will pass off at one of the openings,while the other admits fresh air to support the a few minutes the inside of the globe will be covered withmoisture, and by continuing the experiment, water will rundown its sides, which may be tasted or otherwise same experiment may be made with a large glass tubeinstead of a globe. In this experiment, it is supposed thatthe combustion of the hydrogen is supported by the oxygenof the atmosphere, and therefore,
. Elements of chemistry ... be with two openings,as represented at Fig. the gas burns, the rarefied and vitiated air will pass off at one of the openings,while the other admits fresh air to support the a few minutes the inside of the globe will be covered withmoisture, and by continuing the experiment, water will rundown its sides, which may be tasted or otherwise same experiment may be made with a large glass tubeinstead of a globe. In this experiment, it is supposed thatthe combustion of the hydrogen is supported by the oxygenof the atmosphere, and therefore, nothing can be known ofthe proportions in which they unite. Nor would it be abso-lutely certain by this experiment that it was the oxygen of With what does the student become acquainted by observing the numbersaffixed to names of the elements, and of their compounds ? By analysis,what is the composition of water, by weight and measure ? By whatsimple experiment it may be shown that when hydrogen is burned, water isformed ?. 148 WATER. the atmosphere which combined with the hydrogen, andsupported its combustion. 300. Burned in a Close Vessel.—But when the two gasesarc confined, each in a separate gasometer, and bumedtogether in an exhausted vessel, the result will not onlydemonstrate to the senses that water is the product, butwill also show the exact proportions of each element byweight and measure. For this purpose two graduated gasometers contain thetwo gases, each being furnished with a tube, leading to theglass globe, Fig. 63. Before theexperiment begins, this globe is con- Fig. 63. nected with an air pump, by thescrew c, and completely exhaustedof air, and then accurately is then connected with the twogasometers which contain the gasesby the pipes d and e. When everything is thus prepared, the stop-cockd is opened, and a small stream ofhydrogen let in, which is instantlyinflamed by an electrical spark fromthe conductor «, this being of course connected with
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