initial commit / add all books

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+// Exa 1.18.4

+clc;

+clear;

+close;

+// Given data

+r = 1.278;// in Å

+a = (4*r)/(sqrt(2));// in Å

+a = a * 10^-10;// in m

+V = (a)^3;// in m^3

+At = 63.5;// atomic weight

+N_A = 6.023*10^23;

+m = At/N_A;// in gm

+m = m * 10^-3;// in kg

+n = 4;

+Rho = (m*n)/V;// in gm/m^3

+Rho = Rho * 10^-3;// in kg/m^3

+disp(Rho,"The density of copper crystal in kg/m^3 is");