Abstract
A comparison is given between the osmotic coefficients inferred from direct vapor pressure lowering and from indirect vapor pressure osmometry, for three aqueous surfactant solutions at 25 °C. The results show that vapor pressure osmometry is a rapid but very reliable technique even at room temperature, in contrast to the indications of the manufacturer. Furthermore, the comparison of both techniques reveals that dissolved gas has no noticeable influence on the osmotic coefficients.
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