Nano -sized metal and metal oxide nano - fluids containing particles exhibits higher performance in terms of thermal conductivity. For this purpose, thermal systems are used as working fluids. A lot of thermal and rheological properties of the working fluid is an important parameter to solve the heat problem. Magnesium aluminate spinel in this study (MgAl2O4) nanoscale particles to degrade the pure water into the nano- fluid obtained by participating in specific proportions together with surface activators and thermodynamic properties are determined experimentally. According to contain two different metals in the metal oxide spinel -type oxides metal oxide according to the effects of thermal performance is thought to be more.