Proceedings of the Physical Society Volume 15

Proceedings of the Physical Society Volume 15

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...allow of any experiments being performed there. An exception may be made, however, in the case of nitrogen, which has a very low critical temperature. The following are the values of pa at 16 C. for nitrogen under different pressures determined by M. Amagat (" Memoires sur l'elasticite et la dilatabilite des Fluides jusq'aux tres-hautes Pressions," Ann. Chim. Phys. 6th series, vol. xxix. p. 107). Pressure in Pressure in metres of pv. metres of pv. mercury. mercury. From this table it is evident that at 16 G. for nitrogen we are only a short way off the temperature of minimum deviation from Boyle's law. At temperatures higher than the temperature of minimum deviation the gas would have pv increasing with pressure from the first, and this is what happens with hydrogen at ordinary temperatures. Discussion. Prof. YOUNG said the diagrams representing the observed and calculated isothermals were probably the best ever obtained. Divergence among the values of 'r was explained in part by the smallness of the angle between the theoretical isochor for a perfect gas, and the real isochor. The point of coincidence was difficult to define. Moreover, the values of 1-were obtained from " unsmoothed" values of v. The evidence against the linear law consisted in a certain similarity in the shape of the different curves. It was not easy to see where experimental errors could come in. The peak was a very striking feature of the curves, and the agreement between the results with ether and those of isopentane was very remarkable. These two substances had their boilingpoints close together, their critical temperatures close together, and their molecular weights nearly alike. The two substances more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • United States
  • English
  • black & white illustrations
  • 1236798074
  • 9781236798077