On the tendency of air and the different gases to mutual penetration : a probationary essay, submitted to the Faculty of Physicians and Surgeons of Glasgow / by Thomas Graham.

  • Graham, Thomas, 1805-1869.
Date:
1830
Catalogue details

Licence: Public Domain Mark

Credit: On the tendency of air and the different gases to mutual penetration : a probationary essay, submitted to the Faculty of Physicians and Surgeons of Glasgow / by Thomas Graham. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    the fissure and mix with the hydrogen, except by diffusion. Now in upwards of a dozen experiments of this kind, the air which entered by diffusion amounted to between l-5th and l-4th of the hydrogen, which left the receiver at the same time. But when the circumstances were i-eversed and the column of water allowed to rise in the jar, the quantity of air which entered by diffusion was increased by a portion which entered mechanically; and varied from a third to a fourth part of the quantity of hydrogen which escaped by the fissure. In one experiment, for example, in which the water rose in the jar 0.7 inch above the level in nineteen hours—instead of 48 cubic inches hydrogen there were found 38.7 Hydrogen. 3.3 Air. 6.0 Loss. 48.0 Here 6.0+3.3, or 9.3 cubic inches hydrogen have left the receiver by the fissure, while 3.3 air have entered. The hydrogen which has escaped, has been replaced by fully more than a third of its bulk of air. In another experiment, a jar with a fissure was filled with hydrogen and pressed down by weights in the water trough, so that the water without was at first 3.2 inches above the level of the water within the jar. In four days, the water within the jar had ap- proached to 0.4 inch of its height without. Instead of the original 27 inches of hydrogen, there was now found to be