Science Abstracts Volume 20

Science Abstracts Volume 20

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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. 1917 edition. Excerpt: ...the wires and cools the sphere in liquid air. The suspension is such that the crystal lies in the spherical surface. The vapour condenses on the glass in a thin film apparently of uniform thickness, whilst a pit (015 mm. deep in the case of sulphur) forms in the exposed face which turns grainy. Not all the atoms in the surface seem to assume the vapour form at the same time, therefore, and the evaporation does not appear to be limited to preferential directions. The cosine law, which the author had shown to hold for incident atoms of Hg, Zn, Cd see Abs. 371 (1909), 1317 (1911), 1857 (1916), must thus hold also generally for atoms evaporating from a crystal, as otherwise there could not be equilibrium. H. B. 726. The Shapes of Group Molecules forming the Smfaces of Liquids. I. Langmuir. (Nat. Acad. Sci., Proc. 3. pp. 251-257, April, 1917.)--ln a previous communication Abs. 171 (1917) the author advanced the theory that all the forces involved in the structure of solids and liquids are similar in nature to the forces causing chemical combination. From this point of view he now discusses the subject indicated in the title. The spreading of oil on the surface of water the author regards as being due to an affinity between the COO-groups and water. If only a limited amount of oil is placed on a large surface, the spreading ceases so soon as all the available COO-groups have come into contact with the water. According to this conception, pure hydrocarbons will not spread on water, as indeed is found to be the case. The theory also indicates that the hydrocarbon chains in the oils must be placed above the COO-groups on the surface, and in a homologous series, as the length of the chain increases the thickness of the oil film should also...
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Product details

  • Paperback | 366 pages
  • 189 x 246 x 19mm | 653g
  • United States
  • English
  • black & white illustrations
  • 1236738977
  • 9781236738974