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A density scaled diffusivity function for viscous liquids derived earlier[Phys. Rev. E 79, 032501 (2009)] is revisited, based on an improved equation ofstate assuming that the isothermal bulk modulus increases linearly withpressure. Without making any assumption on the interconnection between thescaling exponent and the Gruneisen parameter, we prove that the scalingexponent is identical with the pressure derivative of the isothermal bulkmodulus. We further discuss probable interconnection between the scalingexponent and the Gruneisen parameter.meter.

Density scaling of the diffusivity in viscous liquids: Identification of  the scaling exponent with the pressure derivative of the isothermal bulk  modulus