Abstract
Letp3=psexp(13·3815t-1·9760t2-0·6445t3-0·1299t4) where t=(1-Ts/T), T is absolute temperature, suffix s denotes the steam point and ps is standard atmospheric pressure, exactly 101 325 N m−2. Then p3 differs from the saturation pressure p of water vapour over a plane surface of the pure liquid phase at temperature T, as predicted by the generally accepted formulations, by less than ±0·1% of p at all temperatures between −50 and 140°C.
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