Abstract:
Further accurate measurements of activation energy En of viscous flow have been made on several light hydrocarbons, namely n-Hexane, Octane, n-Decane and Kerosene oil (Molecular weight =165). With the only exception of Iso-Octane, these results show a regular step-wise structure in En at lower temperatures, and cyclic behaviour at fairly high temperature. A plot of temperature for this transition versus the number of carbon atoms, n, gives a smooth curve with the maximum curvature at n=15. An approximately linear graph for log(n) against this transition temperature has been plotted, together with the freezing and boiling points. These graphs suggest the presence of a transition between two differently. ordered states of the liquids. The behaviour .of iso-Octane is anomalous in that it shows a cyclic variation at the lower temperatures, going over into a constant value of E above the transition temperature.
Page(s):
183-197
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 8, Issue: 4, Year: 1965