Abstract
IN a letter to NATURE (April 3, p. 484), Messrs. Adam and Jessop disagree with the findings of MM. Marcelin (Ann. de Physique, November-December, 459) and Delaplace (C.R., 180, 2020), concerning the relation between the pressure, (F), of the surface films of oleic acid and the area per molecule, (A). The latter investigators find the relation FA = kT, while the former find A largely independent of F. It should be noted that Langmuir (J. Am. Chem. Soc., 39, 1868) obtained two types of FA-curves: when the films were formed on distilled water the FA-curves were steep like those of Adam, and represented irreversible conditions; when expanded on acid solutions the films gave flatter FA-curves, more like those of Marcelin, and were (presumably) reversible. Evidently there exists a disturbing factor and it will repay to inquire into its probable nature.
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COFMAN, V. The ‘Gas Laws’ in Surface Solutions. Nature 117, 755–756 (1926). https://doi.org/10.1038/117755a0
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DOI: https://doi.org/10.1038/117755a0
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