. The London, Edinburgh and Dublin philosophical magazine and journal of science. cular 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 o
. The London, Edinburgh and Dublin philosophical magazine and journal of science. cular 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 liquid and vapour have nearly the same density asoccurs near the critical point. Chemical Attraction between Atoms from Physical Data, 87 Suppose the curves A/ A2f, B/ B2, . . ., in fig. 3represent the graphs of this equation corresponding to the Fisr. temperatures Tlf T2, . . Let the abscise o£ the points«3, 63, • • •? denote the values of pz or (p\ —P2) of a liquid incontact with its saturated vapour. The ordinates of thepoints then give the surface tension at different equation of a set of curves which pass through the points«3, h, . ., is a formula for the surface tension. An infinitenumber of such sets of curves can be obtained. It follows,therefore, in the same way as before that the law of molecularattraction deduced from surface tension data should containan arbitrary function. Next let us suppose that the attraction between two mole-cules a given distance apart is independent of the tempera-ture. Let the graph of the equation for the surface tensionin this case be represented by the curve A/ A2, in fig. 4,the points az, fe3, . ., having the same meaning as equation of the surface tension of a liquid in cont
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