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517Therefore the neglect of the effect of pressure on the fugacity function of the reduced pressure for constant reduced temperaof normal pentane would in this case introduce an error of tures. about 18 per cent. Since these conditions of temperature and pressure are frequently encountered in the absorption of natural gasoline, it is necessary to consider the effect of (1) Gibbs, J. IT., Trans. Conn. Acad., 3, 108-248 (1876) pressure on the fugacity of liquid hydrocarbons. These calcu-(2) G.Am.373 49 (1901). (3) Lewis and Randall, "Thermodynamics," McGraw-Hill, 1923. lations have been made and are presented in Figure 2, in (4) poynting, J , H., PhLl. dvag,, [SI 12, 32 (1881). which the fugacity of the liquid hydrocarbons is plotted as a (5) Tunnell, J . P h y s .

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