... CHEMICAL SOCIETY AMERICAN CHEMICAL SoCIETY All RightsRuerv«l AU Rightll Reserved Physical Properties Published on January 1, 1961 on http://pubs.acs.org | doi: 10.1021/ba-1955-0015.ch001 Of Chemical ... + C')2 + PHYSICAL PROPERTIES OF CHEMICAL COMPOUNDS Since PV/RT may be assumed to be 1.0000 at th the temperature corresponding to 30 mm., and is also 1.0000 at 25° C., the molar heat of vaporization ... Density at 20° C., etc., g./ml a, b: Constants of Law of Rectilinear Diameters, dv + dL = a + bt d = density of the vapor, g./ml.; dL = density of the liquid, g./ml ng', etc.: Refractive index...