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diff --git a/Engineering_Physics_/Chapter1.ipynb b/Engineering_Physics_/Chapter1.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:b22f521510881a8fff0ac38eb4b560555d5bde9f0fb22681533a13e45849f4b7"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "1: Crystallography and Crystal imperfection"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 1.1, Page number 40"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "n=4;          #number of atoms per unit cell(FCC)\n",
+      "M=63.54;            #atomic weight of Cu(gm)\n",
+      "N=6.023*10**23;         #avagadro number(per g mole)\n",
+      "d111=2.08;       #interplanar spacing(angstrom)\n",
+      "h=1;\n",
+      "k=1;\n",
+      "l=1;\n",
+      "\n",
+      "#Calculation\n",
+      "d111=d111*10**-8;       #interplanar spacing(m)     \n",
+      "a=d111*math.sqrt((h**2)+(k**2)+(l**2));      \n",
+      "D=(n*M)/(N*(a**3));          #density of Cu(g/cc)\n",
+      "\n",
+      "#Result\n",
+      "print \"density of Cu metal is\",round(D,3),\"g/cc\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "density of Cu metal is 9.024 g/cc\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file