New experimental density data have been used to improve a recently pub
lished correlation of n-alkane densities, based on the Tait equation.
The new correlation covers the n-alkanes from methane to n-hexadecane
in an extended pressure range of up to 500 MPa in some cases. The over
all average deviation of the experimental measurements of the density
from those calculated by the correlation is +/-0.10%. A simple extensi
on to n-alkane mixtures gives a satisfactory prediction of the density
compared with experimental data.