Transactions and Proceedings of the Royal Society of South Australia (Incorporated) Volume 28-29

Transactions and Proceedings of the Royal Society of South Australia (Incorporated) Volume 28-29

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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. 1904 edition. Excerpt: ...T', the surface tension if no double layer were present. "Suppose the contact difference of potential between the mercury and the solution be E, the mercury being at the higher potential. Then, if an external E M F be applied so that the wire X" (leading to the mercury) "is positive, the difference of potential between the mercury and the solution will be greater than E by the amount of the applied E M F, and hence the charges on the double layer will be increased, so that the surface tension will be decreased, and to keep the meniscus in its sighted position the head of mercury... must be reduced. lf, however, the applied E M F is in such agdirection that it acts in the opposite direction to the contact difference of potential at the meniscus, then the strength of the double layer will decrease, and hence the surface tension 'will increase. This increase will go on till the applied E M F Is exactly equal, and opposite to the contact difference of potential, for when this occurs there will be no double layer, and hence the surface tension will possess the value which It would have if no electrical charges were present. If the applied E M F is further increased, then a double layer will fligaln be formed, but with the negative charge on the mercury 81de. This inverted double layer will cause a decrease in the surface tension, since the presence of such a double layer must decrease the surface tension, whichever side is positive. Hence, by applying an external E M F, so as to make the mercury negative, and increasing it till the surface_ tension, as indicated by the pressure which has to be apphed to bring the meniscus to its sighted position, is a maximum, will be exactly equal and opposite to the contact...show more

Product details

  • Paperback | 242 pages
  • 189 x 246 x 13mm | 440g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236913183
  • 9781236913180