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diff --git a/Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_12.ipynb b/Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_12.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12 - Properties of Gaseous mixtures"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1 - Pg 201"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Calculate the partial pressure and specific humidity\n",
+      "#initialization of varaibles\n",
+      "P=15. #psia\n",
+      "T2=70.+460 #R\n",
+      "T1=55.+460 #R\n",
+      "#calculations\n",
+      "pw=0.2141\n",
+      "pA=P-pw\n",
+      "mratio=pA*29/(pw*18.)\n",
+      "mAbym=mratio/(1+mratio)\n",
+      "mwbym=1/(1+mratio)\n",
+      "pg=0.3631 #psia\n",
+      "phi=pw/pg\n",
+      "gamma=1/mratio\n",
+      "#results\n",
+      "print '%s %.2f %s' %(\"Partial pressure of water vapor = \",pA,\"psia\")\n",
+      "print '%s %.4f %s' %(\"\\n Specific humidity = \",gamma,\"lb vapor/lb air\")\n",
+      "print '%s %.2f' %(\"\\n Relative humidity = \",phi)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Partial pressure of water vapor =  14.79 psia\n",
+        "\n",
+        " Specific humidity =  0.0090 lb vapor/lb air\n",
+        "\n",
+        " Relative humidity =  0.59\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 2 - Pg 201"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the mass of watervapor per pound of dry air\n",
+      "#initialization of varaibles\n",
+      "rh=0.75\n",
+      "pg=0.5069\n",
+      "inc=10 #in\n",
+      "pA=29.50 #psia\n",
+      "#calculations\n",
+      "pw=rh*pg\n",
+      "p=(29.50+ inc/13.6)*0.491\n",
+      "pA=p-pw\n",
+      "mratio=pw*18/(pA*29.)\n",
+      "#results\n",
+      "print '%s %.4f %s' %(\"Pounds of water vapor enter the surface per pound of dry air =\",mratio,\"lb vapor/lb air\")\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Pounds of water vapor enter the surface per pound of dry air = 0.0163 lb vapor/lb air\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file