INVESTIGATION OF SOME REGULARITIES FOR DENSE FLUIDS USING A SIMPLE EQUATION OF STATE

A simple equation of state for dense fluids is used to investigate som e empirically known regularities and also to explore some new ones. Th e known regularities predicted by the EOS are (i) there is a common bu lk modulus point at which bulk modulus versus density of different iso therms of any fluid intersect at that single point and (ii) for each i sochore with density greater than the Boyle density pressure versus te mperature is linear. The new regularities explored by the EOS are (iii ) there is a common compression point at which the compression factor against density of different isotherms of any dense fluid intersects a t that single point and (iv) (B-r - 1)v(2) varies Linearly with rho(2) for each isotherm of any dense fluid, where B-r is the reduced bulk m odulus and rho = 1/v is the molar density of the fluid. Experimental d ata were used to show the validity of the new regularities. A physical interpretation for each regularity is given.