Abstract:
Tables of transport and thermodynamic nitrogen properties
computed by I. A. Sokolova in wide range of temperature and
pressure are approximated by 2D tensor product splines. These
approximations have the same accuracy as original tables (relative
$l_2$ error ${\sim}1\%$, max error ${\sim}5\%$). They have less
number of parameters and allow to obtain thermophysical
coefficients at any temperature and pressure in the given range.
Approximations may be used as a reference data. Simple program is
included for the approximations to be readily involved in
practice.
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