THE THERMAL CONDUCTIVITY OF PURE LEAD

Abstract

Results of two previously unreported determinations of the thermal conductivity of very pure lead are given. The first set of measurements covered the temperature range −40 to +310 °C, while the second set covered the range 25 to 170 °C to check a small irregularity of the first set. The resistance ratio R/R0 of the first sample was measured from 0 °C to 160 °C. The results may be expressed within 1% by the linear equation K = 0.3555 – 1.36t/104 watt cm−1 °C−1. The Lorenz number drops linearly by about 0.5% between 0 and 150 °C.