An experimental study is described on the effect of liquid properties on axial dispersion in packed beds. Working with water between 278 and 373 K, the range 57<Sc<1,930 was covered, and this represents a significant fraction of the domain located between what is traditionally considered “gas behavior” (that is, Sc≅1) and “liquid behavior” (typically, Sc>600). A representation of PeL vs. Pem reveals the existence of a very flat minimum (typically 102<Pem<104) for each value of Sc. The value of the minimum is almost insensitive to variations in Sc, for Sc>700, but it increases significantly with a decrease in Sc, for Sc<700. The experimental data used to test available correlations for predicting DL show that they are inaccurate over considerable ranges of the variables.