Reference data on the viscosity of rarefied steam at a temperature of 2000to 2500 K

An extensive array of experimental data on the coefficients of viscosity an d self-diffusion of rarefied steam at temperatures ranging from 280 to 1773 K is fitted using relations of molecular kinetic theory and the generalize d four-parameter Stockmayer potential. The parameters are found, namely, th e collision diameter d = 2.495 Angstrom, the depth of potential well epsilo n = 689.7 K, the exponent of the repulsion branch m = 9, the dipole moment mu = 1.803 D, and their error matrix. The tables of reference data are calc ulated up to 2500 K. The estimates are suggested of their confidence errors , as well as the upper limit of the model validity with respect to temperat ure.