Use of Nanofluids is widely adopted to enhance the thermal performance of conventional fluids. Numerous experiments have been done on Nanofluid to increase the heat transfer in which different nanoparticles and base fluids are selected. Here, two different nanoparticles Silver (Ag) and titanium dioxide (TiO₂) with 1-5% by volume are introduced in six different base fluids to make Nanofluids, and then thermal property of Nanofluid is inspected. Two distinct correlations are used to investigate the thermal property of Nanofluids of which one is theoretical and other is experimental. Results are compared with both the correlations which shows that Silver/Benzene Nanofluid is better than TiO₂/Benzene for heat transfer in heat pipes. Also it is observed that increasing the concentration of nanoparticles increases the thermal conductivity of Nanofluids. By addition of 1% nanoparticles by volume 3% increment in thermal conductivity can be achieved at 300K temperature. Similarly, at 5% concentration by volume 15% of thermal conductivity may be achieved at same temperature.