Revised list of TBCs

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diff --git a/Elements_of_thermal_technology_by_John_H._Seely/Surface.ipynb b/Elements_of_thermal_technology_by_John_H._Seely/Surface.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 5: Surface Tension"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Exa 5.1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Work (dyn cm or erg) =  5.03e+04\n",
+      "press enter key to exit\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "''"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#If the surface tension of a soap bubble is 0.4 N/m, what work is required to\n",
+    "#increase the diameter from 5 to 15 cm?\n",
+    "import math\n",
+    "#initialisation of variables\n",
+    "St= 0.04 \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t#N/m\n",
+    "d1= 5. \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t#cm\n",
+    "d2= 15. \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t#cm\n",
+    "#CALCULATIONS\n",
+    "W= St*1000.*2*4*math.pi*(math.pow((d2/2),2)-math.pow((d1/2),2))\t\t#Work\n",
+    "#RESULTS\n",
+    "print '%s %.2e' % ('Work (dyn cm or erg) = ',W)\n",
+    "raw_input('press enter key to exit')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Exa 5.2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Presuure difference (lbf/ft^2) =  14.12\n",
+      "press enter key to exit\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "''"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#By much does the pressure inside a 0.017 in droplet of water at 20C\n",
+    "#exceed the outside pressure.\n",
+    "import math\n",
+    "#initialisation of variables\n",
+    "R= 0.017 \t\t\t\t\t\t\t\t\t\t\t\t#in\n",
+    "sigma= 72.8 \t\t\t\t\t\t\t\t\t\t\t#m N/m\n",
+    "#CALCULATIONS\n",
+    "P= (2*sigma*0.005*0.017)/(72.8*R*7.08*math.pow(10,-4))\t#Presuure difference\n",
+    "#RESULTS\n",
+    "print '%s %.2f' % ('Presuure difference (lbf/ft^2) = ',P)\n",
+    "raw_input('press enter key to exit')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Exa 5.3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      " Difference in mercury level (cm (depression)) =  -2.48\n",
+      "press enter key to exit\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "''"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#A 0.4 mm diameter glass tube stands vertically in a dish of mercury at 20C.\n",
+    "#Determine the difference between the level of mercury in the dish and in\n",
+    "#the tube. The specific gravity for mercury is 13.6 and the contact angle \n",
+    "#with glass is 130C\n",
+    "import math\n",
+    "#initialisation of variables\n",
+    "d= 13.6 \t\t\t\t\t\t\t#gm/cm^3\n",
+    "g= 980 \t\t\t\t\t\t\t\t#cm/s^2\n",
+    "D= 0.4 \t\t\t\t\t\t\t\t#mm\n",
+    "angle= 130*math.pi/180. \t\t\t#radians\n",
+    "s= 514. \t\t\t\t\t\t\t#dyn/cm\n",
+    "#CALCULATIONS\n",
+    "h= (4*s*10*math.cos(angle))/(d*g*D)\t#Depression in mercury level\n",
+    "#RESULTS\n",
+    "print '%s %.2f' % (' Difference in mercury level (cm (depression)) = ',h)\n",
+    "raw_input('press enter key to exit')"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}