. The London, Edinburgh and Dublin philosophical magazine and journal of science. graph. Let thedifference between the ordinates Cj a2, &,, b2, . ., denote thelatent heat of a liquid corresponding to the temperatures Tl5T2, . . Let the curve N1? N2, possess the property that thedifference between the ordinates of cx and a2 is equal to thedifference of the ordinates of c2 and a2 in the curve A/, A2\and the difference between the ordinates of b{ b2 in the curveNj N2 is equal to the difference of the corresponding ordinatesin curve A/ A2, and so on. It is obvious that the curveN] N2 subject to th
. The London, Edinburgh and Dublin philosophical magazine and journal of science. graph. Let thedifference between the ordinates Cj a2, &,, b2, . ., denote thelatent heat of a liquid corresponding to the temperatures Tl5T2, . . Let the curve N1? N2, possess the property that thedifference between the ordinates of cx and a2 is equal to thedifference of the ordinates of c2 and a2 in the curve A/, A2\and the difference between the ordinates of b{ b2 in the curveNj N2 is equal to the difference of the corresponding ordinatesin curve A/ A2, and so on. It is obvious that the curveN] N2 subject to these conditions may have an infinite varietyof shapes. Now the equation of the curve Nj N2 gives thelatent heat in terms of p, and as the curve may have aninfinite variety of shapes there are an infinite number of suchequations. If the curve is expressed by a single equation itmust contain an arbitrary function : and the law of attraction 86 Dr. R. D. Kleeman : Determinations of the Law of to which it corresponds must therefore also contain anarbitrary function, Fig. Kext let ns consider the determination of the law ofmolecular attraction from surface tension data. The surfacetension of a liquid may be defined as the work done againstthe molecular attraction per of new surface formed incutting a thick slab of liquid into two parts and separatingthem by an infinite distance. If the liquid is surrounded byvapour of density p2 we may suppose that an amount ofmatter of density p2 remains stationary in space when theslabs are separated, which is equivalent to separating twoslabs (not surrounded by vapour) each of density (p1—p2)*.Let the equation of the surface tension of a substance forany value of {pi—p2) or pB, deduced from a knowledge of thelaw of attraction between 1he molecules, be A^^ (T, /j3). * This is strictly admissible only if matter consists of molecules in-finitely small in size, but devia ions due to this not being the case ■willoccur only when the liqui
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
