ln(p/po) = a1 + a2/T + a3×ln(T) + a4×T + a5×T2 + a6×T6+ a7/T4
ln(p/po) = A + B/(T + C); where po = 1 kPa
lg(p/po) = a + b/T + c×lg(T) + d×T + e/T2 ; where po = 1 kPa and lg = log10
ln(p/po) = a + b/T + c×ln(T) + d×T2 + e/T2 ; where po = 1 kPa
ln(p/po) = a + b/T + c×ln(T) + d×Te ; where po = 1 kPa