Relationship between thermodynamics and dynamics of supercooled liquids

Relationship between thermodynamics and dynamics of supercooled liquids was investigated. Experiments and computer simulations reveal a quantitative link between dynamics and configurational entropy in supercooled liquids. Excess entropy, a fundamental thermodynamic quantity that captures the correlations between particles due to their finite volumes and mutual interactions, does capture the diffusivity of equilibrium fluids. Simulations for a broad range of thermodynamic conditions were performed, where the model displays pronounced increase in self-diffusivity upon isothermal compression. The results presented evidence that supercooling a fluid modifies its diffusivity, suggesting that dynamics, from ideal gas to glass, is related to a single, standard therodynamic quantity.