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+// Ex12_5 Page:247 (2014)
+clc; clear;
+e = 1.6e-019;   // Charge on an electron, C
+m = 9.1e-031;   // Mass of an electron, kg
+K = 327;    // Thermal conductivity of Zn, W/m/K
+N_A = 6.023e+026;    // Avogadro's number/k-mol
+T = 300;    // Room temperature, K
+tau = 2.5e-014; // Relaxation time of electrons in divalent Zn, s
+d = 7.13e+03;   // Density of Zn, kg/metre-cube
+A = 65.38;  // Atomic weight of Zn, g/mol
+N = 2*d*N_A/A;  // Number of electrons per unit volume, per metre-cube
+sigma = N*e^2*tau/m;    // Electrical conductivity of Zn,  mho/m
+L = K/(sigma*T);    // Lorentz number for Zn, W-ohm/Sq.K
+printf("\nLorentz number for Zn = %5.3e W-ohm/Sq.K", L);
+
+// Result
+// Lorentz number for Zn = 1.180e-08 W-ohm/Sq.K