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It was recently shown by computer simulations that a large class of liquidsexhibits strong correlations in their thermal fluctuations of virial andpotential energy [Pedersen et al., Phys. Rev. Lett. 100, 015701 (2008)]. Amongorganic liquids the class of strongly correlating liquids includes van derWaals liquids, but excludes ionic and hydrogen-bonding liquids. The presentnote focuses on the density scaling of strongly correlating liquids, i.e., thefact their relaxation time tau at different densities rho and temperatures Tcollapses to a master curve according to the expression tau proptoF(rho^gamma/T) [Schroder et al., arXiv:0803.2199]. We here show how tocalculate the exponent gamma from bulk modulus and specific heat data, eithermeasured as functions of frequency in the metastable liquid or extrapolatedfrom the glass and liquid phases to a common temperature (close to the glasstransition temperature). Thus an exponent defined from the response to highlynonlinear parameter changes may be determined from linear responsemeasurements.

Estimating the density scaling exponent of viscous liquids from specific heat and bulk modulus data