  A recently proposed expression to describe the temperature and volume
dependences of the structural (or alpha) relaxation time is discussed. This
equation satisfies the scaling law for the relaxation times, tau = f(TV^g),
where T is temperature, V the specific volume, and g a material-dependent
constant. The expression for the function f is shown to accurately fit
experimental data for several glass-forming liquids and polymers over an
extended range encompassing the dynamic crossover, providing a description of
the dynamics with a minimal number of parameters. The results herein can be
reconciled with previously found correlations of the isochoric fragility with
both the isobaric fragility at atmospheric pressure and the scaling exponent g.
