A new representation of the viscosity of propane includes a zero-densi
ty correlation and an initial-density dependence correlation based on
the kinetic theory of dilute gases and on the Rainwater-Friend theory.
The higher density contributions of the residual viscosity in the rep
resentation are formed by a combination of double polynomials in densi
ty and reciprocal temperature, and a free-volume term with a temperatu
re-dependent close-packed density. The full surface correlation is bas
ed on a set of primary experimental data selected as a result of a cri
tical assessment of the available information from 37 original viscosi
ty studies. The review refers to 96 citations altogether. The validity
of the representation extends from the triple point to 600 K and 100
MPa in accordance with the modified Benedict-Webb-Rubin equation of st
ate. The uncertainty of the representation varies from +/-0.4% for the
viscosity of the dilute gas phase between room temperature and 600 K,
to about +/-2.5% for the range 100-475 K up to about 30 MPa, and to a
bout +/-4% for points outside this range. Tables of the viscosity acco
rding to the representative equations at selected temperatures and pre
ssures and along the saturation line provide easy reference as well as
the validation of computer codes. (C) 1998 American Institute of Phys
ics and American Chemical Society. [S0047-2689(98)00405-X].