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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 23: Polymer Materials"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 23.1, page no-625"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Sulphur required for final rubber product\n",
+      "\n",
+      "import math\n",
+      "#Variable Declaration\n",
+      "p_wt=500                      # weight of final rubber product\n",
+      "w1= 32.0                      # atomic weight of sulphur\n",
+      "w2= 54.0                      # weight of monomer unit\n",
+      "\n",
+      "#Calculation\n",
+      "s_req=w1/(w1+w2)\n",
+      "s_req= math.floor(s_req*100)/100\n",
+      "\n",
+      "\n",
+      "#Result\n",
+      "print('Therefore, sulphur required for %d *10^3 kg of final  rubber product = %d * 10^-3 kg'%(p_wt,s_req*p_wt))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Therefore, sulphur required for 500 *10^3 kg of final  rubber product = 185 * 10^-3 kg\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 23.2, page no-625"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Photon energy to break C C bond\n",
+      "\n",
+      "import math\n",
+      "#Variable Declaration\n",
+      "E=370*10**3                  # energy of c-c bond j/mol\n",
+      "lam=3200*10**-10             # wavelength of UV light\n",
+      "h=6.626*10**-34              # Planck's constant\n",
+      "c=3*10**8                    # speed of light\n",
+      "\n",
+      "#Calculation\n",
+      "E1=h*c/lam\n",
+      "Ec=E/(6.02*10**23)\n",
+      "\n",
+      "#Result\n",
+      "print('\\nE=%.1f*10^-19 J'%(E1*10**19))\n",
+      "print('\\nThe Energy of c-c Bond = %.1f * 10^-19'%(Ec*10**19))\n",
+      "print('\\n\\nThe UV light photon energy is sufficient to break a C-C bond.\\nTherefore, the polymer deteriorates under the influence of UV light')"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "E=6.2*10^-19 J\n",
+        "\n",
+        "The Energy of c-c Bond = 6.1 * 10^-19\n",
+        "\n",
+        "\n",
+        "The UV light photon energy is sufficient to break a C-C bond.\n",
+        "Therefore, the polymer deteriorates under the influence of UV light\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file