Added(A)/Deleted(D) following books

 A  Principles_of_Physics_by_F.J.Bueche/Chapter10_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter10_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter11_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter13_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter14_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter15_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter16_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter17_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter18_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter19_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter1_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter1_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter20_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter21_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter22_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter23_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter24_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter25_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter26_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter27_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter2_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter2_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter3_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter3_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter4_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter4_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter5_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter5_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter6_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter6_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter7_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter7_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter8_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter9_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/Chapter9_2.ipynb
A  Principles_of_Physics_by_F.J.Bueche/chapter12_1.ipynb
A  Principles_of_Physics_by_F.J.Bueche/screenshots/11.2_1.png
A  Principles_of_Physics_by_F.J.Bueche/screenshots/24.4_1.png
A  Principles_of_Physics_by_F.J.Bueche/screenshots/8.4_1.png

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diff --git a/Principles_of_Physics_by_F.J.Bueche/chapter12_1.ipynb b/Principles_of_Physics_by_F.J.Bueche/chapter12_1.ipynb
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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 12:Thermodynamics"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex12.1:pg-413"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The work done by the gas is= -220.0  J\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example 12_1\n",
+    " \n",
+    "  \n",
+    "  #To find the work done by the gas\n",
+    "d1=800           #Units in meter**3\n",
+    "d2=500           #Units in meter**3\n",
+    "p1=5*10**5       #Units in Pa\n",
+    "w1=p1*(d1-d2)*10**-6      #Units in J\n",
+    "p2=2*10**5       #Units in Pa\n",
+    "d3=200*10**-6        #Units in meter**3\n",
+    "p3=3*10**5         #Units in Pa\n",
+    "w2=(p2*d3)+(0.5*p3*d3)        #Units in J\n",
+    "print \"The work done by the gas is=\",round(-(w1+w2)),\" J\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex12.2:pg-415"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The estimated Cv value of nitric acid is Cv= 693.0  J/Kg K\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example 12_2\n",
+    " \n",
+    "  \n",
+    "  #To estimate the Cv of nitric acid\n",
+    "r=8314        #Units in J/Kmol K\n",
+    "m=30        #Units in Kg/Kmol\n",
+    "Cv=2.5*(r/m)         #Units in J/Kg K\n",
+    "print \"The estimated Cv value of nitric acid is Cv=\",round(Cv),\" J/Kg K\"\n",
+    "  #in textbook the answer is printed wrong as Cv=690 J/Kg K correct answer is 692 J/Kg K\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex12.3:pg-415"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The final temperature is T2= 886.0  K\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example 12_3\n",
+    " \n",
+    "  \n",
+    "  #To find the final temperature\n",
+    "t1=27      #units in Centigrade\n",
+    "t1=t1+273   #Units in K\n",
+    "gama=1.4     #Units in Constant\n",
+    "p1=1        #units in Pa\n",
+    "v1_v2=15      #Units of in ratio\n",
+    "logT2=math.log10(t1)-((gama-1)*(math.log10(p1)-math.log10(v1_v2)))\n",
+    "T2=10**logT2                #Uniys in K\n",
+    "print \"The final temperature is T2=\",round(T2),\" K\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex12.4:pg-417## "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "This type of process is termed as throttling process and described by the equation Delta U=- Delta W\n",
+      "\n",
+      "Where Delta W is the work done\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example 12_4\n",
+    " \n",
+    "  \n",
+    "  #To describe the Temperature changes of the gas\n",
+    "print \"This type of process is termed as throttling process and described by the equation Delta U=- Delta W\\n\"\n",
+    "print \"Where Delta W is the work done\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex12.5:pg-418## "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The entropy is Delta S= 24.5  J/K\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example 12_5\n",
+    " \n",
+    "  \n",
+    "  #To findout by how much the entropy of the system changes\n",
+    "m=20         #Units in gm\n",
+    "alpha=80      #Units in cal/gm\n",
+    "t=4.184                 #Units in J/Cal\n",
+    "Q=m*alpha*t        #Units in J\n",
+    "T=273        #Units in K\n",
+    "S=Q/T          #Units in J/K\n",
+    "print \"The entropy is Delta S=\",round(S,1),\" J/K\"\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Ex12.6:pg-419## "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The amount of Electricity is required is Delta W= 11666.0  J\n"
+     ]
+    }
+   ],
+   "source": [
+    "  import math   #Example 12_6\n",
+    " \n",
+    "  \n",
+    "  #To findout how much electricity is needed\n",
+    "Tc=278           #Units in K\n",
+    "Th=293         #Units in K\n",
+    "COP=Tc/(Th-Tc)            #Units in ratio\n",
+    "Qc=210000            #Units in J\n",
+    "W=Qc/COP                     #Units in J\n",
+    "print \"The amount of Electricity is required is Delta W=\",round(W),\" J\"\n"
+   ]
+  }
+ ],
+ "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": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}