Wells's principles and applications of chemistry; . jar. (See o, Fig. 14.) If,on the contrary, we fill the jar with air,and place it in an atmosphere of carbonicacid, the movement takes place in anopposite direction—a little air flows outof the bottle into the carbonic acid, but solarge a quantity of the gas passes theopposite way, that the India rubber swellsout, and caps the bottle like a dome, (See&, Fig. 14.) 52. Diffusion of Gases.—Connected with this subjectis another interesting class of phenomena, known as thediffusion of gases. When two liquids which are wanting in any attractionfor e
Wells's principles and applications of chemistry; . jar. (See o, Fig. 14.) If,on the contrary, we fill the jar with air,and place it in an atmosphere of carbonicacid, the movement takes place in anopposite direction—a little air flows outof the bottle into the carbonic acid, but solarge a quantity of the gas passes theopposite way, that the India rubber swellsout, and caps the bottle like a dome, (See&, Fig. 14.) 52. Diffusion of Gases.—Connected with this subjectis another interesting class of phenomena, known as thediffusion of gases. When two liquids which are wanting in any attractionfor each other, as oil and water, are mixed together, theyseparate after standing at rest, and arrange themselvesaccording to their specific gravities, the heaviest at thebottom and the lightest at the top. If, however, alight and heavy gas are once mixed together, no sepa-ration takes place, but the two remain permanently in-termingled. It has also been found that every gas, or gaseous mix-ture, possesses the power of diffusing itself equally. QuKBTiOTsrs—Does endosmotic action take place between different erases ? What areillustrations of it ? What is meant by the diffusion of gases ? How is each gas affectedas regards the presence of another gas ? 40 PRINCIPLES OF CHEMIST ET. Fig. 15. throngli every other gas witli which it is brought in con-tact, and this, too, in opposition to the action of theirweight, or gravity. Thus, carbonic acid gas is twentj-two times heavier thanhydrogen gas, but if a jar filled with hydrogen be placed withits mouth downward over the mouth of a jar filled with car-bonic acid, as shown in Fig. 15, the two will difiuse them-selves so completely that in a few moments each jar will eon-tain equal quantities of both gases. Each gas appears to act as void, orempty space for another, or, in other words,it spreads, or expands into the space occu-pied by another gas, as if it were a same law applies also to vapors. Thus, as much steam can be for
Size: 1572px × 1589px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectchemistry, bookyear18
