[CONTRIBUTION FROM THE DEPARTMENT OF CHEMISTRY AND CHEMICAL ENGINEERING OF THE UNIVERSITY OF WASHINGTON] ... The Liquid-Vapor Equilibrium of the System Tungsten Hexafluoride-Perfluoro- ... BY EJ BARBER AND G. H. CADY' ... The system tungsten hexafluoride-perfluoro-n-pentane has been studied under conditions of a constant temperature of 25' and also under conditions of a constant pressure of 1.5 atmospheres. A positive ...