Experimental determinations of the vapor pressures of the normal paraffins ethane through n-decane are reported from their respective triple points to about 10 mm of Hg. The steady-state gas-saturation technique and apparatus used for the measurements are described.

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An 8 cm3 positive displacement plunger pump and its associated control systems are described. A choice of 224 precise flow rates from 0.36 cm3/min to 8×10−8 cm3/min is possible. Calibration flow mixtures of paraffin hydrocarbons in helium were prepared in the range 10−7–10−11 mole/sec.

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