Containerless processing allows deep undercooling of liquid metals, alloys, glasses, and ceramics. Thermophysical properties, such as viscosity, surface tension, density, and specific heat, may be measured using non-contact methods. While electrostatic levitation is done under high vacuum, surface tension and viscosity results may be affected by oxide films or dissolved oxygen. Oxygen control is desirable for investigation of novel high-temp materials, e.g. aerospace alloys, where precise knowledge of transport phenomena or oxygen diffusion defines the potential application limits. The surface tension of molten metals is often affected by even a small amount of adsorption of surface active elements such as oxygen. Models were used to predict the surface tension of Inconel 718, and measurements were taken to compare with the models.