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diff --git a/Fluid_Mechanics_by_John_F_Douglas/Chapter_13.ipynb b/Fluid_Mechanics_by_John_F_Douglas/Chapter_13.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:1f446f61d8838d40d2e31fd72ef3a0bc1e1a7f291c54a48c1366aef232ac3797"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 13: Compressible Flow around a Body"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.1, Page 444"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      "\n",
+      " #Initializing  the  variables\n",
+      "rho0  =  1.8;\n",
+      "R  =  287;\n",
+      "T  =  75+273;                                                          #  Temperature  in  kelvin  \n",
+      "gma  =  1.4;  \n",
+      "Ma  =  0.7;\n",
+      "\n",
+      " #Calculations\n",
+      "P0  =  rho0*R*T;\n",
+      "c  =  (gma*R*T)**0.5;\n",
+      "V0  =  Ma*c;\n",
+      "Pt  =  (P0**((gma-1)/gma)  +  rho0*((gma-1)/gma)*(V0**2/(2*P0**(1/gma))))**(gma/(gma-1));\n",
+      "rhoT  =    rho0*(Pt/P0)**(1/gma);\n",
+      "Tt  =    Pt/(R*rhoT)-273;\n",
+      "\n",
+      "print \"Staganation Pressure (kN/m2 ) :\",round(Pt/1000,1)\n",
+      "print \"Temperature (Degree Celcius)  :\",round(Tt,1)\n",
+      "print \"Density of airstream (kg/m3)  :\",round(rhoT,3)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Staganation Pressure (kN/m2 ) : 249.4\n",
+        "Temperature (Degree Celcius)  : 109.1\n",
+        "Density of airstream (kg/m3)  : 2.274\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.2, Page 454"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      "\n",
+      " #Initializing  the  variables\n",
+      "R  =  287;\n",
+      "T  =  28+273;\n",
+      "gma  =  1.4;\n",
+      "P  =  1.02*10**5;\n",
+      "rhoHg  =  13.6*10**3;\n",
+      "g  =  9.81;\n",
+      "\n",
+      " #Calculations\n",
+      " #Case(a)\n",
+      "U0  =  50;\n",
+      "c  =  (gma*R*T)**0.5;\n",
+      "Ma  =  U0/c;\n",
+      "rho  =  P/(R*T);\n",
+      "DelP  =  0.5*rho*U0**2;                                        #Pt-P\n",
+      "ha  =  DelP/(rhoHg*g);\n",
+      "\n",
+      " #Case(b)\n",
+      "U0  =  250;\n",
+      "Ma  =  U0/c;\n",
+      "Pt  =  P*(1+(gma-1)*Ma**2/2)**(gma/(gma-1));    \n",
+      "DelP  =  Pt-P\n",
+      "hb  =  DelP/(rhoHg*g);\n",
+      "\n",
+      " #Case  (c)\n",
+      "U0  =  420;\n",
+      "Ma1  =U0/c;\n",
+      "P2  =  P*((2*gma/(gma+1))*Ma1**2  -  ((gma-1)/(gma+1)));\n",
+      "N  =  Ma1**2  +2/(gma-1);                                      #  Numerator\n",
+      "D  =  2*gma*Ma1**2/(gma-1)-1;\n",
+      "Ma2  =  (N/D)**0.5;\n",
+      "Pt2  =  P2*(1+(gma-1)*Ma2**2/2)**(gma/(gma-1));\n",
+      "hc  =  (Pt2-P2)/(rhoHg*g)  ;    \n",
+      "\n",
+      "print \"Difference in height of mercury column in case (a) in mm :\",round(ha*1000,2)\n",
+      "print \"Difference in height of mercury column in case (b) in mm :\",round(hb*1000,1)\n",
+      "print \"Difference in height of mercury column in case (c) in mm :\",round(hc*1000,0)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Difference in height of mercury column in case (a) in mm : 11.06\n",
+        "Difference in height of mercury column in case (b) in mm : 314.2\n",
+        "Difference in height of mercury column in case (c) in mm : 684.0\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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