  Several correlations between viscosity and surface tension for saturated
normal fluids have been proposed in the literature. Usually, they include three
or four adjustable coefficients for every fluid and give generally good
results. In this paper we propose a new and improved four-coefficient
correlation which was obtained by fitting data ranging from the triple point to
a point very near to the critical one. Fifty four substances were considered,
including simple fluids (such as rare gases), simple hydrocarbons,
refrigerants, and some other substances such as carbon dioxide, water or
ethanol. The new correlation clearly improves the results obtained with those
previously available since it gives absolute average deviations below1% for 40
substances and below 2.1% for 10 substances more.
