THE HEAT CAPACITY AT CONSTANT VOLUME OF THE SYSTEM ETHYLENE NEAR THE CRITICAL TEMPERATURE AND PRESSURE

Abstract

The heat capacity of ethylene at constant volume has been investigated through the critical range, between 6.5° and 27 °C., at an average density slightly greater than the critical. The heat capacity in the immediate neighborhood of the critical temperature is found to be a function of the previous thermal treatment of the system. The results indicate the persistence of a large amount of molecular interaction in ethylene above the critical temperature, and are in agreement with the concept that the liquid state of aggregation can persist above the temperature at which the visible meniscus disappears.