Abstract
Experimental information available in the literature for the density behavior of the saturated liquid state of 46 nonpolar and polar substances has been modeled according to the expression, /rho/ /sub R/ = 1 + ..cap alpha.. (1 - T /sub R/ ) /sup m/ + ..beta..(1 - T /sub R/ ) /sup n/ , in which /rho/ /sub R/ is the ratio of the density at reduced temperature T /sub R/ to the critical density. This relationship has been found to apply over the complete range between the triple point and the critical point. Exponent m is a universal constant (m = 3/8). The critical constants and normal boiling points are needed to establish ..cap alpha.., ..beta.., an n for nonpolar substances. For polar substances, the dipole moment is also required. Saturated liquid densities calculated with correlated values of ..cap alpha.., ..beta.., and n have been compared with corresponding experimental measurements to yield an overall average deviation of 0.83% (4284 points) for the 46 substances used in this development This generalized treatment has been applied to 16 additional substances to yield for them an average deviation of 1.14% (669 points).
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