![]() The calculated critical pressure was found to be (2,739.7 for both of these approaches. He estimates that the vapor pressure curve has an uncertainty of 0.2% to 0.3% in the vicinity of the triple point, decreasing to 0.03% to 0.05% in the range 300 K to 400 K, and increasing to about 0.1% at 500 K. The author has also used thermodynamic more ยป calculations and published thermal data to extend the vapor pressures down to the triple point (182.603 K). The adjusted results were found to be in good agreement with the best available data from the literature, and a reliable vapor pressure curve could be established for temperatures up to the critical point (540.13 K). The sample purity was determined by chromatographic analysis, and the measured pressures were adjusted for the presence of the impurities found. ![]() Measurements spanned the temperature range from 335 K to 503 K, and measured pressures ranged from 30 kPa to 1,597 kPa. ![]() The author has used a metal ebulliometer to make measurements of the vapor pressures of heptane.
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