Dulong studied the elasticity of steam, the measurement of temperatures, and the behavior of elastic fluids.
2.
The device consisted of an elastic fluid-filled collapsible-tube mounted inside a chamber filled with air.
3.
He showed " in all elastic fluids observed under the same conditions, the molecules are placed at equal distances ".
4.
In 1777 he issued a " Treatise on the Different kinds of Elastic Fluids or Gases " ( new edition, 1779 ).
5.
In 1754, Euler sent to the Berlin Academy a further paper in which starting from the hypothesis that light consists of vibrations excited in an elastic fluid by luminous bodies and that the difference of color of light is due to the greater or lesser frequency of these vibrations in a given time he deduced his previous results.
6.
He ascertained that water was densest at about 40 �F ( 4 �C ) ( and not at the freezing temperature ); he was the originator of the theory, later reactivated by John Dalton, that the quantity of water vapour contained in any space is independent of the presence or density of the air, or of any other elastic fluid.
7.
It may be noted that in a paper on the proportion of the gases or elastic fluids constituting the atmosphere, read by him in November 1802, the law of multiple proportions appears to be anticipated in the words : " The elements of oxygen may combine with a certain portion of nitrous gas or with twice that portion, but with no intermediate quantity ", but there is reason to suspect that this sentence may have been added some time after the reading of the paper, which was not published until 1805.
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