Substitution of the critical temperature (267.01°) and volume (0.416 liter per mole) into the equation gives a calculated pressure of 28.75 atm. The observed pressure is 27.00 atm.; and the error of extrapolation from 2 to 2.40 moles per liter is 6.5%. SummaryMeasurements are reported on the compressi-bility of liquid normal heptane over the temperature range from 30 to 250°and to 350 atmospheres, and on the compressibility of the gas phase from 275 to 350°and from a density of 1.0 to 5.0 moles per liter.The constants of an equation of state for the gas phase are determined from the data for densities less than the critical.Cambridge, Mass.

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