Unlike the Lee/Kessler correlation, this correlation remains accurate even for highly polar fluids, and unlike the two-parameter Lyderson-Greenkorn-Hougen correlation, does not require knowledge of the density, making it more useful near the critical point of the liquid.  
The Spencer and Danner modification to it replaces the critical compressibility with a namesake factor unique to each component.  Unlike the Lee/Kessler correlation, this correlation remains accurate even for highly polar fluids, and unlike the two-parameter Lyderson-Greenkorn-Hougen correlation, does not require knowledge of the density, making it more useful near the critical point of the liquid.  Given as V-sat equals the critical volume times the critical compressibility raised to the quantity 1 minus the reduced temperature to the two sevenths power, FTP, what is this equation that can be used to estimate the molar volume of a saturated liquid?
The Spencer and Danner modification to it replaces the critical compressibility with a namesake factor unique to each component.  
Rackett equation or correlation