initial commit / add all books

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+// Exa 1.18.3

+clc;

+clear;

+close;

+// Given data

+At = 28;// Atomic weight

+n = 4;

+N_A = 6.023*10^23;

+a = 5.3;// in Å

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

+m = At/N_A;// in gm

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

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

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

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

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