  In 1966 Pelofsky proposed an empirical linear correlation between the natural
logarithm of the surface tension and the reciprocal viscosity, which seems to
work adequately for a wide range of fluids. In particular, it has been shown
that it is useful in the case of n-alkanes and their binary and ternary
mixtures. More recently however, it has been found not to work for several
ionic liquids unless the reciprocal viscosity is raised to a power. The
exponent of this power was fixed to be 0.3, at least for the studied ionic
fluids. In the present work, the performance and accuracy of both the original
Pelofsky correlation and the modified expression including the exponent are
studied for 56 non-ionic fluids of different kinds over a broad range of
temperatures. Also, the temperature range is delimited for which each
expression reproduces the surface tension values with average absolute
deviations below 1%. The needed coefficients are given for both the broad and
the delimited temperature range for each expression. Unfortunately, the results
show that the value of the exponent in the modified Pelofsky expression is
substance-dependent for the normal fluids studied.
