The temperature variation of orthobaric density difference in liquid‐vapour systems. IV. Fatty acids

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Abstract
The density of a series of fatty acids has been determined over ranges of temperature below and above the boiling point. It is shown that the variation of orthobaric density difference with temperature is well represented by the Verschaffelt equation. In general the exponent does not depart greatly from the standard value for non‐associated systems and its variability with temperature is not so marked as that found for water and the aliphatic alcohols. The equation applies with considerable precision to acetic acid from 0° to 280°C. The mean deviation between observed and calculated values of the orthobaric density difference for the higher acids generally does not exceed 0.3%.