Comment on “Correlation lengths and density fluctuations in supercritical states of carbon dioxide”

Using empirical equations of state for carbon dioxide and argon, we show that density fluctuations in supercritical fluids reach a maximum at a particular density Pρmax (T). As the temperature increases beyond the critical temperature, Tc, ρmax (T) deriviates increasingly from the critical density, ρc. This contradicts recent suggestions by Nishikawa et al.