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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