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diff --git a/Thermodynamics_by_J._P._Holman/ch13.ipynb b/Thermodynamics_by_J._P._Holman/ch13.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:11cb16e5df43b71fcfcbd028a413a4b4822b665e44e65d30bde344b1e73319cb"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 13 :\n",
+      "Thermodynamics of irreversible\n",
+      "processes"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.1 pg : 377"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\t\t\t\n",
+      "# Variables\n",
+      "Eab1 = 0.\n",
+      "Eab2 = 5.87 \t\t\t#mV\n",
+      "T1 = 150.    \t\t\t#F\n",
+      "T2 = 200. \t    \t\t#F\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "Eab =  -1.12+ 0.035*T1\n",
+      "pi1 = 0.035*(T1+460)\n",
+      "pi2 = 0.035*(T2+460)\n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"Thermocouple reading at %d F  =  %.2f mv\"%(T1,Eab)\n",
+      "print \" Peltier coefficient at %d F  =  %.1f mv\"%(T1,pi1)\n",
+      "print \" Peltier coefficient at %d F  =  %.1f mv\"%(T2,pi2)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Thermocouple reading at 150 F  =  4.13 mv\n",
+        " Peltier coefficient at 150 F  =  21.4 mv\n",
+        " Peltier coefficient at 200 F  =  23.1 mv\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.2 pg : 380"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\t\t\t\n",
+      "# Variables\n",
+      "T = 0.   \t\t\t#C\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "de1 = -72. \t\t\t#mV/C\n",
+      "de2 = 500. \t\t\t#mv/C\n",
+      "alpha = de1-de2\n",
+      "pi = -(T+273)*alpha\n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"Peltier coefficient at %d C  =  %d mv\"%(T,pi/1000)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Peltier coefficient at 0 C  =  156 mv\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file