Correlation of vapour pressure,temperature, and latent heat of vaporisation

The vapour pressures of six liquids have been measured in the approximate range 0.05 to 200 torr and correlated with that of benzene by a method published in an earlier paper. The relationship so obtained which is linear for non-associated substances and is valid from critical conditions to a vapour pressure at least as low as 0.1 torr presents a reliable method of extrapolation of vapour pressure data. It may also be used (at vapour pressures below ? 100 torr) to evaluate the entropy and latent heat of vaporisation of a liquid from even scant vapour pressure data.