This document summarizes the synthesis and characterization of a nanofluid with water as the base fluid. It discusses the types of nanoparticles and nanofluids, describes the synthesis of cerium oxide nanoparticles and the nanofluid, and presents the experimental methodology used to measure properties like density, viscosity, and thermal conductivity of the nanofluid at varying temperatures and nanoparticle concentrations. The results show that the density, viscosity, and thermal conductivity of the nanofluid increase with increasing nanoparticle concentration. The maximum thermal conductivity achieved is 0.747 W/m-K at a concentration of 1.5% and temperature of 75°C.