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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)
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