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diff --git a/1694/CH6/EX6.18/Ex6_18.sce b/1694/CH6/EX6.18/Ex6_18.sce
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+clear;
+clc;
+printf("\nEx-6.18\n");
+//page no.-192
+//given
+T=0;........//temperature in kelvin
+rho=10500;....//density of Ag in Kg/m^3
+M=107.9;......//atomic weight
+N=6.025*10^26;....//avagadro no.
+e=1.6*10^-19;.....//charge
+h=6.63*10^-34;....//planck's constant in Js
+
+no=(N*rho)/M......//no of free electrons per unit vol
+
+E=(3*no/%pi)^(2/3)*(h^2)/(8*m*e)......//fermi energy in eV
+
+printf("\nfermi energy is 5.518 eV");