A text-book on chemistryFor the use of schools and colleges . SOLID CARBONIC ACID. 297 If through a tube the breath be made to pass intolime-water, a deposit of carbonate of lime renders thewater milky; or if the breath be conducted through lit-mus water, the color changes to red; the air thus ex-pired from the lungs contains three or four per cent, ofcarbonic acid. A man throws out about eight ouncesof carbon as carbonic acid every day. Under a pressure of thirty-six atmospheres, or by be-ing cooled to -—106°, carbonic acid condenses into a liq-uid four times more expansible by heat than atmo
A text-book on chemistryFor the use of schools and colleges . SOLID CARBONIC ACID. 297 If through a tube the breath be made to pass intolime-water, a deposit of carbonate of lime renders thewater milky; or if the breath be conducted through lit-mus water, the color changes to red; the air thus ex-pired from the lungs contains three or four per cent, ofcarbonic acid. A man throws out about eight ouncesof carbon as carbonic acid every day. Under a pressure of thirty-six atmospheres, or by be-ing cooled to -—106°, carbonic acid condenses into a liq-uid four times more expansible by heat than atmosphericair. Thiloriers condensation apparatus is shown inFig. 270. It consists of two iron cylinders—A, em- Fig. ployed as a retort to generate the gas; B, as a is charged with a mixture of carbonate of soda andwater; a brass tube, C, containing oil of vitriol, is intro-duced into it, and the head is screwed on. A is theninverted, and. carbonic acid is generated under greatpressure. A tube, E, is next made to connect A and B,the latter vessel being immersed in ice. The liquefiedgas distills over into B. A tube, 5, descends nearly tothe bottom of B, and terminates above in a fine nozzle, How can its existence in the breath be proved ?liquefied ? Describe the apparatus. N2 How may it be 298 CAEBUEETED HYDE0GEN. e. As soon as the stopcock at the top of B is openedthe liquid carbonic acid is forced out at e by the press-ure of its vapor, it evaporates rapidly, and, in so doing,produces great cold. A portion of the gas is solidified,and if the jet open into a box, D, the solidified acid col-lects as a flocculent, snowy-white deposit. Mixed withether, it produces a temperature of —166°.
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