Open AccessThe density of the vapours in equilibrium with water, ethyl alcohol, methyl alcohol and benzene
Publication year - 1930
Publication title -
philosophical transactions of the royal society of london. series a, containing papers of a mathematical or physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9258
pISSN - 0264-3952
DOI - 10.1098/rsta.1930.0007
Subject(s) - vapor pressure , benzene , vapours , chemistry , alcohol , water vapor , thermodynamics , aqueous solution , analytical chemistry (journal) , chromatography , organic chemistry , psychology , physics , neuroscience
Aim of the Resarch. —The ultimate aim of the research was to put the vapour pressure method of determining osmotic pressures on to a sound experimental basis. For that purpose it was necessary to investigate the following :— (1) The validity of DALTON’s law. (2) The extent of the association among vapour molecules. (3) The dependence of this association on temperature. The agreement found by BERKELEY, HARTLEY and BURTON between the osmotic pressures of aqueous solutions derived from the lowering of the vapour pressure and those directly observed shows, when it is remembered that their vapour pressure method is in reality a measurement of the relative vapour densities, that there is no great departure from DALTON’s law, nor any great change in association with the relative concentration of vapour and air. Their experimental errors were of the order of 0.5 per cent., so that to obtain further light greater accuracy will be required.