THE THERMAL-CONDUCTIVITY OF TOLUENE AND WATER

A new instrument is presented to measure the thermal conductivity of p olar and electrically conducting liquids based on the transient coated hot-wire method. The performance of the apparatus has been assessed w ith toluene and water, which are recognized as standard reference mate rials for nonpolar and polar fluids, respectively. New results are rep orted fort the thermal conductivity of these liquids between 298 and 3 70 K and at pressures slightly above the saturation. The results show that the instrument is capable of an accuracy better than +/-0.5%, whi le the precision and reproducibility are better than +/-0.3%.