Key words: Thermal conductivity, liquids, coaxial cylinders method.

Abstract: Thermal conductivity is an important thermophysical property; its value is required in all heat transfer calculations. This study deals with the elaboration of theoretical principles of measurement and with the  realization of an apparatus based on the coaxial cylinders method allowing us to obtain, simply, the thermal conductivity of liquids. In this work, we have measured the variation of thermal conductivity versus temperature of some liquids like ethanol and ethylene glycol. Thermal conductivities of some other liquids are measured at 25°C. The obtained results have been compared with literature data and they present a good agreement with them.