Recently, the new advancement in nanotechnology leads to production a new group of fluids (nanofluids) with innovative heat transport properties. These fluids are developed by dispersing nanometer-sized particles ranging from 10-50nm in the conventional heat transfer fluids. Nanofluids perform substantially in numerous areas of science and engineering. The advanced and low-cost performance is due to the superior thermophysical properties which included thermal conductivity, viscosity, density, thermal expansion, electrical conductivity, and heat capacitance. This manuscript presents an over on theoretically and experimentally established models for thermophysical properties. A deep survey of experimental and theoretical studies are necessary to illuminate the drawbacks in the results and appropriate insight of heat transfer improved properties of nanofluids