The present review gives a brief introduction to liquid state theories
and gives the latest applications of the theory of liquids to alloys,
fused salts, polymers and the derivative of potential function operat
ing in liquids. The application of these potential function to obtain
phonon frequencies and thermodynamic properties in commercially import
ant liquids like Ge and Te has been described. We also give a novel me
thod of evaluation of the diffusion coefficient 2nd its pressure deriv
ative.