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+// Scilab Code Ex4.3: Page-112 (2006)
+clc; clear;
+m = 9.1e-031;   // Mass of an electron, kg
+e = 1.6e-019;   // Charge on an electron, C
+r = 1.28e-010;  // Atomic radius of cupper, m
+a = 4*r/sqrt(2);    // Lattice parameter of fcc structure of Cu, m
+V = a^3;    // Volume of unit cell of Cu, metre cube
+n = 4/V;    // Number of atoms per unit volume of Cu, per metre cube
+tau = 2.7e-04;  // Relaxation time for an electron in monovalent Cu, s
+sigma = n*e^2*tau/m;    // Electrical conductivity of Cu, mho per cm
+printf("\nThe free electron density in monovalent Cu = %5.3e per metre cube", n);
+printf("\nThe electrical conductivity of monovalent Cu = %5.3e mho per cm", sigma);
+
+// Result 
+// The free electron density in monovalent Cu = 8.429e+028 per metre cube
+// The electrical conductivity of monovalent Cu = 6.403e+017 mho per cm 
+