Abstract
The steady heat flow through a thin layer of distilled water enclosed between the horizontally parallel flat end surfaces of two copper bars of 50 mm diameter and the temperature gradient in the water layer were measured for different thicknesses of the water layer in the temperature range between 1.0 and 9.0°C. From the relations between the heat flow, temperature gradient and thickness of the water layer, the thermal conductivity of water was estimated. The thermal conductivity of distilled water above 4.0°C obtained by this experiment is about 7% higher than that below this temperature. These experimental results, thus, permit us to conclude that the thermal conductivity of water in relation to the temperature has a discontinuity near 4.0°C, where a phase transition is observed.
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