Abstract
If a thin wire within a liquid is heated electrically by a constant current its temperature increases after a short induction time of 0.1 to 0.5 second proportionally to the logarithm of time. To facilitate the evaluation, the increase of temperature of the wire is recorded on the Y-axis of a X-Y recorder, the deflection of which on the X-axis is proportional to the logarithm of time. Therefore the increase of temperature is recorded as a straight line for the time for which the logarithmic law is valid. The slope of this line is inversely proportional to the thermal conductivity of the medium. In this way the thermal conductivities of liquids may be measured in a few minutes.
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