Jumping transition in the liquid's heat capacity revealed by the scanning transitiometry

Abstract

AbstractThis manuscript reports the direct observations of the clear jump transition of the specific orthobaric heat capacity to the specific isochoric heat capacities during the continuous heating of liquid samples in a closed vessel as well as the respective theory explaining such effects. The measurements have been performed with n‐heptane and toluene and the results have been thoroughly analyzed with the derived equations and compared with the values from the known literature data. The detection and accurate tracking of a jump in the heat capacity far from the standard points of phase transitions are not only of fundamental thermodynamic interest but also demonstrates future research targets and now attainable data which can be achieved by modern calorimetric technology. It has been proven that by using high‐pressure scanning calorimeter (transitiometry technology) it is possible to directly measure the specific orthobaric heat capacities and specific isochoric heat capacities accurately.