  We calculate using molecular dynamics simulations the transport properties of
realistically modeled fluid argon at pressures up to $\simeq 50GPa$ and
temperatures up to $3000K$. In this context we provide a critique of some newer
theoretical predictions for the diffusion coefficients of liquids and a
discussion of the Enskog theory relevance under two different adaptations:
modified Enskog theory (MET) and effective diameter Enskog theory. We also
analyze a number of experimental data for the thermal conductivity of
monoatomic and small diatomic dense fluids.
