In this work, density, molar volume and surface tension are systematically measured for the complete binary Al-V system. Both, density and surface tension are measured versus the temperature for several Al-V alloys of different compositions. A linear decrease in density and surface tension, respectively, could be observed for increasing temperature. Subsequent linear fits of density and surface tension allow for an analysis of the compositional dependence of both properties. An increase in density and surface tension was found for increasing vanadium content. The findings in compositional dependence are compared with different models for the ideal and regular solution of Al-V.   
Additionally, the surface tension of pure Vanadium with different oxygen contents is probed in order to gain insights on how oxygen alters the systems thermophysical properties. After measuring the surface tension of different vanadium samples mixed with different amounts of vanadium oxide (V2O5) powder, a simple model was developed, to predict the decrease in surface tension for increasing oxygen contents.