Abstract
A four-parameter equation for vapour pressure is derived by integrating the Clapeyron equation with the aid of an empirical expression for the ΔH/Δ a wide range of reduced temperatures for 21 liquids which are representative of different classes of compounds: polar compounds, non-polar compounds, h Three methods for the application of the new equation are discussed. The best of these is more accurate than the Thek-Stiel equation although it does n An equation for calculating vaporization enthalpies is also derived.
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