Liquids: Dynamics of liquid structure

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Abstract
The study of the liquid state is predominately an experimental subject so any useful definition of “dynamical structure” in liquids should be closely related to the types of experiments employed in these studies. Most studies of the liquid state have been carried out for fluids lying on or near the liquid-vapor coexistence curve, the line connecting the triple point (T.P.) and the critical point (C.P.). The shaded portion of Figure 1 indicates this region. The term dynamical structure suggests measurements on systems which are not in thermodynamic equilibrium. Even so, equilibrium properties are determined through the application of the fluctuation dissipation theorem. Before we present a heuristic definition of dynamical structure, let us first consider an example which illustrates this definition.