II. The ammonia—isooctane system

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Abstract
Because of the paucity of data on the phase behavior of binary systems that form azeotropes, the P‐V‐T‐x relations of the ammonia‐isooctane system were determined at the liquid‐vapor boundaries from room temperature to the critical temperature of issoctane. Evidence of an azeotrope existing over a very limited pressure and temperature range was obtained. The sistem is unique in that the critical locus contains a minimum temperature point as well as a minimum and a maximum pressure point. These relations are shown to fit a general pattern of phase relations characteristic of binary systems that form azeotropes in the critical region. This pattern serves as an aid for the qualitative prediction of the P‐T‐x relations of such systems.