2 7, p. 45 2), assuming that two liquids may be compared when the ratios of the volumes of the liquids to the volumes of the saturated vapours are the same, deduced that yV 3 (where y is the surface tension, and V the molecular volume of the liquid) causes all liquids to have the same temperature coefficients.
If when P changes to P+w volume V changes to V - v then (P -f -w) (V - v)y = PVy, whence w= P (-yv -[-y(y2 I) V2) = y V (I 4:y-1 }- y 2 I J.
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