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+//Example number 6.11, Page number 121
+
+clc;clear;
+close;
+
+//Variable declaration
+Kb=1.38*10**-23;     //boltzmann constant(J/k)
+m=9.1*10**-31;      //mass(kg)
+tow=3*10**-14;    //relaxation time(sec)
+n=8*10**28;      //density of electrons(per m**3)
+T=273;     //temperature(K)
+//Calculation
+sigma_T=3*n*tow*T*Kb**2/(2*m);      //thermal conductivity(W/mK)
+//Result
+printf("thermal conductivity is %.3f W/mK",sigma_T)