removing problem statements

5 files changed, 95 insertions, 286 deletions

diff --git a/Elements_Of_Mass_Transfer_Part_1/ch2.ipynb b/Elements_Of_Mass_Transfer_Part_1/ch2.ipynb
index b72246a4..db1c8564 100644
--- a/Elements_Of_Mass_Transfer_Part_1/ch2.ipynb
+++ b/Elements_Of_Mass_Transfer_Part_1/ch2.ipynb
@@ -1,6 +1,7 @@
 {
  "metadata": {
-  "name": ""
+  "name": "",
+  "signature": "sha256:63ec039d8e0cb7cbcf7792965630fc54de76590123e48dd89f9e70d5575deae0"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -27,9 +28,6 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# diffusivity of nitrogen carbondioxide mixture\n",
-      "\n",
-      "# let A denote nitrogen and B denote carboondioxide\n",
       "\n",
       "#  variable declaration    \n",
       "rA=.3798;\n",
@@ -80,10 +78,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#diffusivity of hydrogen chloride mixture\n",
-      "# let A denote Hydrogen chloride and B denote air\n",
-      "\n",
-      "#  variable declaration   \n",
+      " \n",
       "\n",
       "#\"part(ii)\"\n",
       "rA=.3339;\n",
@@ -136,8 +131,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# the diffusivity of isoamyl alcohol\n",
-      "#kopp's law is valid\n",
+      " \n",
       "\n",
       "#  variable declaration    \n",
       "\n",
@@ -180,9 +174,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# diffusivity of ccl4 through oxygen\n",
-      "\n",
-      "#  variable declaration    \n",
+      "   \n",
       "\n",
       "pa1=(33./760)*1.013*10**5;              #vapour pressure of ccl4 at 273 in pascal\n",
       "pa2=0;\n",
@@ -233,10 +225,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# rate at which crystal dissolves\n",
-      "\n",
-      "\n",
-      "#  variable declaration     \n",
+      "     \n",
       "\n",
       "z=.0305*10**-3;                   #wall thickness sorrounding the crystal\n",
       "x1=0.0229;\n",
@@ -288,16 +277,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  rate of diffusion of alcohol water vapour mixture\n",
-      "#position 1    moles       molefraction\n",
-      "#   air        80           0.8\n",
-      "#   water      20           0.2\n",
-      "\n",
-      "#position 2      moles      molefraction\n",
-      "#    air       10           0.1\n",
-      "#   water      90           0.9\n",
-      "\n",
-      "#  variable declaration     \n",
+      "  \n",
       "\n",
       "ya1=0.8;\n",
       "ya2=0.1;\n",
@@ -341,9 +321,6 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  rate of diffusion if water layer is stagnant\n",
-      "\n",
-      "#  variable declaration   \n",
       "\n",
       "ya1=0.8;\n",
       "ya2=0.1;\n",
@@ -389,9 +366,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# rate of loss of hydrogen\n",
-      "\n",
-      "#  variable declaration  \n",
+      " \n",
       "T=298.;                       #temperature in kelvin\n",
       "pt=1.*1.013*10**5;            #total pressure in pascal\n",
       "ID=25.*10**-3;                #internal diameter in m of unvulcanised rubber in m\n",
@@ -441,9 +416,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# ammonia diffusion through nitrogen\n",
-      "\n",
-      "#  variable declaration    \n",
+      "   \n",
       "pa1=(1.5)*10**4;                #vapour pressure of ammonia at pt.1 \n",
       "pa2=(0.5)*10**4;                #vapour pressure of ammonia at pt.2\n",
       "Dab=2.3*10**-5                  #molecular diffusivity in m**2/s\n",
@@ -486,17 +459,9 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  rate at which crystal dissolves\n",
-      "#position 1    moles       molefraction    weight\n",
-      "#   ethanol    0.1478         0.02775      6.80\n",
-      "#   water      5.18           0.9722       93.20\n",
       "\n",
       "import math\n",
-      "#position 2    moles      molefraction      weight\n",
-      "#    ethanol   0.235         0.0453        10.8\n",
-      "#   water      4.96        0.9547          89.20\n",
-      "\n",
-      "#  variable declaration   \n",
+      "  \n",
       "\n",
       "z=0.4*10**-2;            #film thickness sorrounding the crystal\n",
       "xa1=0.0453;              #mole fraction of ethanol at pos.2\n",
@@ -549,14 +514,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# diffusion rate of acetic acid\n",
-      "#position 1        kmoles       molefraction    weight\n",
-      "#   acetic acid    0.167         0.0323      10\n",
-      "#   water           5           0.9677       90\n",
-      "\n",
-      "#position 2         kmoles      molefraction      weight\n",
-      "#    aceitic acid     0.067         0.0124        4\n",
-      "#   water             5.33        0.9876          96\n",
+      " \n",
       "import math\n",
       "#  variable declaration    \n",
       "\n",
@@ -612,10 +570,9 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# rate of mass transfer\n",
-      "#  variable declaration   \n",
+      " \n",
       "\n",
-      "#part (i)\n",
+      " \n",
       "r=(50./2)*10**-3;       #radius pf circular tube\n",
       "pa1=190;                #vapour pressure of ammonia at pt.1 \n",
       "pa2=95;                 #vapour pressure of ammonia at pt.2\n",
@@ -661,9 +618,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  partial pressure of co2\n",
-      "#part (i)\n",
-      "#  variable declaration    \n",
+      "    \n",
       "\n",
       "r=(50./2)*10**-3;          #radius pf circular tube\n",
       "pa1=(190.);                #vapour pressure of ammonia at pt.1 \n",
@@ -714,10 +669,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusion flux if N2 is non diffusing\n",
-      "\n",
-      "#  variable declaration     \n",
-      "\n",
+      " \n",
       "ya1=0.2;                            #initial mole fraction\n",
       "ya2=0.1;                            #final mole fraction\n",
       "T=298                               #temperature  in kelvin\n",
@@ -762,10 +714,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# diffusion flux of oxygen\n",
-      "\n",
-      "#  variable declaration    \n",
-      "\n",
+      " \n",
       "ya1=0.2;\n",
       "ya2=0.1;\n",
       "T=(298);                            #temperature  in kelvin\n",
@@ -808,10 +757,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusion flux through inert air\n",
-      "\n",
-      "#  variable declaration    \n",
-      "# ammonia diffusing through inert air and air is non-diffusing\n",
+      " \n",
       "ya1=0.1;\n",
       "ya2=0;\n",
       "T=293.                              #temperature  in kelvin\n",
@@ -871,14 +817,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusion rate of acetic acid\n",
-      "#position 1        moles       molefraction    weight\n",
-      "#   acetic acid    0.15         0.0288          9\n",
-      "#   water           5           0.9712          91\n",
-      "\n",
-      "#position 2         moles      molefraction      weight\n",
-      "#    aceitic acid     0.05         0.0092           4\n",
-      "#   water             5.389        0.9908          96\n",
+      " \n",
       "#  variable declaration     \n",
       "T=290.0;                    #temperature in kelvin\n",
       "z=2*10**-3;                 #film thickness sorrounding the water\n",
@@ -933,9 +872,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusion flux of nitrogen\n",
-      "\n",
-      "#  variable declaration     \n",
+      " \n",
       "\n",
       "ya1=0.2;                          #molefraction at pos.1\n",
       "ya2=0.1;                          #molefraction at pos.2\n",
@@ -988,9 +925,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusion rate of loss of benzene\n",
-      "\n",
-      "#  variable declaration    \n",
+      " \n",
       "\n",
       "pa1=0.2*10**5;            #partial pressure at pos.1\n",
       "pa2=0;                    #partial pressure at pos.2\n",
@@ -1037,9 +972,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  rate of diffusion of alcohol water vapour mixture\n",
-      "\n",
-      "#  variable declaration    \n",
+      " \n",
       "\n",
       "ya2=0.1;                             #molefraction at pos.2\n",
       "ya1=0.8;                             #molefraction at pos.1\n",
@@ -1093,9 +1026,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusion rate of ammonia\n",
-      "\n",
-      "#  variable declaration    \n",
+      " \n",
       "\n",
       "ya2=0;                       #molefraction at pos.2\n",
       "ya1=0.1;                     #molefraction at pos.1\n",
@@ -1163,8 +1094,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#ate of evaporation\n",
-      "\n",
+      " \n",
       "#  variable declaration  \n",
       "pa1=0.418*10**5;              #partial pressure initially\n",
       "pa2=0;                        #partial pressure of pure air\n",
@@ -1213,8 +1143,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusivity of the mixture in stefan tube of toluene in air\n",
-      "\n",
+      " \n",
       "#  variable declaration  \n",
       "\n",
       "#stefan tube experiment\n",
@@ -1271,9 +1200,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# diffusion flux of a mixture of benzene and toluene\n",
-      "\n",
-      "#this is the case of equimolar counter diffusion as the latent heat of vaporisation are very close to each other\n",
+      " \n",
       "#  variable declaration  \n",
       "\n",
       "T=(360);                            #temperature  in kelvin\n",
@@ -1325,9 +1252,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusivity of the mixture in stefan tube\n",
-      "\n",
-      "#stefan tube experiment(pseudo steady state diffusion)\n",
+      " \n",
       "#  variable declaration  \n",
       "\n",
       "Ml=92.;                     #molecular weight of toluene\n",
@@ -1382,8 +1307,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusivity of ccl4\n",
-      "#  variable declaration  \n",
+      " \n",
       "#variation in liquid level with respect to time is given below\n",
       "%pylab inline\n",
       "t=[26,185,456,1336,1958,2810,3829,4822,6385]\n",
@@ -1472,9 +1396,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  rate of transfer of nitrogen and hydrogen\n",
-      "#  variable declaration  \n",
-      "#it is the case of equimolar conter diffusion as the tube is perfectly sealed to two bulbs at the end and the pressure throughout is constant\n",
+      "\n",
       "d=0.001;\n",
       "area=3.14*(d/2)**2;     #area of the bulb\n",
       "T=298.;                  #temperature in kelvin \n",
@@ -1521,10 +1443,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusivity of methanol in carbon tetrachloride\n",
-      "#  variable declaration  \n",
-      "#using wilke and chang empirical correlation\n",
-      "#Dab=(117.3*10**-18)*(phi*Mb)**0.5*T/(u*va**0.6);\n",
+      " \n",
       "\n",
       "T=288;                          #temperature in kelvin\n",
       "Mb=32;                          #molecular weight of methanol\n",
@@ -1565,11 +1484,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusivity of methanol in water\n",
-      "\n",
-      "#using wilke and chang empirical correlation\n",
-      "#Dab=(117.3*10**-18)*(phi*Mb)**0.5*T/(u*va**0.6);\n",
-      "#  variable declaration  \n",
+      " \n",
       "T=288.0;                          #temperature in kelvin\n",
       "Mb=18.0;                          #molecular weight of methanol\n",
       "phi=2.26;                        #association factor for solvent\n",
@@ -1609,8 +1524,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  rate of passage of hydrogen\n",
-      "#  variable declaration  \n",
+      "  \n",
       "u=20.*10**-6;                        #viscosity in Ns/m**2\n",
       "pt=2666.;                          #total pressure in N/m**2\n",
       "pa1=pt;                            #pressure at 1\n",
diff --git a/Elements_Of_Mass_Transfer_Part_1/ch3.ipynb b/Elements_Of_Mass_Transfer_Part_1/ch3.ipynb
index ab9df3da..42c74db2 100644
--- a/Elements_Of_Mass_Transfer_Part_1/ch3.ipynb
+++ b/Elements_Of_Mass_Transfer_Part_1/ch3.ipynb
@@ -1,6 +1,7 @@
 {
  "metadata": {
-  "name": ""
+  "name": "",
+  "signature": "sha256:3744cb249ffd9e10c950b9110990dfac9cd54ad63b8fe61f5671a88b4822fb4c"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -27,7 +28,6 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# rate of sublimation\n",
       "\n",
       "# Variable Declaration      \n",
       "v=6.;       #velocity in m/s\n",
@@ -80,8 +80,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# rate of sublimation of solid naphthalene\n",
-      "\n",
+      " \n",
       "# Variable Declaration   \n",
       "v=0.30;           #velocity of parallelair in m/s\n",
       "t=300;            #temperature of air in kelvin\n",
@@ -134,8 +133,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#rate of absorption and mass transfer coefficient\n",
-      "# Variable Declaration   \n",
+      "    \n",
       "\n",
       "# a is CO2 and b is water\n",
       "p=2.;              #total pressure at 1 in atm \n",
@@ -192,8 +190,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  mass transfer coefficient and film thickness\n",
-      "# Variable Declaration   \n",
+      " \n",
       "NA=7.5*10**-7;       #mass flux in gmol/cm**2*s\n",
       "Dab=1.7*10**-5;     #diffusivity if SO2 in water in cm**2/s\n",
       "c=1./18.02;          #concentration is density/molecular weight in gmol/cm**2*s\n",
@@ -241,8 +238,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# value of liquid and gas film coefficient\n",
-      "# Variable Declaration   \n",
+      "\n",
       "Kg=2.72*10**-4;            #overall gas phase mass transfer coefficient in kmol/m**2*S*atm\n",
       "r_gas=0.85*(1/Kg);        #given that gas phase resisitance is 0.85 times overall resistance\n",
       "kg=1.0/r_gas;            \n",
@@ -304,10 +300,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# concentration of ammonia and interfacial partial pressure\n",
-      "# Variable Declaration   \n",
-      "#kg/kl=0.9=t       \n",
-      "#Pai=0.3672*Cai    so;              \n",
+      "         \n",
       "m=0.3672;\n",
       "t=.9;\n",
       "        #Pai and Cai indicates interfacial pressure and conc.\n",
@@ -358,7 +351,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  diffusivity of gas overall transfer cofficient\n",
+      " \n",
       "# Variable Declaration   \n",
       "D=.1;\n",
       "l=3;             # l is length of bubble in cm\n",
@@ -418,7 +411,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  overall gas phase mass transfer flux\n",
+      " \n",
       "# Variable Declaration  \n",
       "Kg=7.36*10**-10;\n",
       "p=1.013*10**5;\n",
@@ -543,7 +536,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  concentration of acid at outlet\n",
+      " \n",
       "# Variable Declaration   \n",
       "Cas=1.521*10**-7;\n",
       "v=1525;       #velocity in m/s\n",
diff --git a/Elements_Of_Mass_Transfer_Part_1/ch5.ipynb b/Elements_Of_Mass_Transfer_Part_1/ch5.ipynb
index 8e575f33..5acdca48 100644
--- a/Elements_Of_Mass_Transfer_Part_1/ch5.ipynb
+++ b/Elements_Of_Mass_Transfer_Part_1/ch5.ipynb
@@ -1,6 +1,7 @@
 {
  "metadata": {
-  "name": ""
+  "name": "",
+  "signature": "sha256:2ee4e5f8137c7268975819ca4a31ef66c4a59076a802f56667cecd1c3f67b2a9"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -27,7 +28,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# properties through humidity chart\n",
+      " \n",
       "\n",
       "# Variable Declaration \n",
       "#dry bulb temperature=50  and  wet bulb temperature=35 \n",
@@ -125,8 +126,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# properties if DBT is 25 and WBT is 22\n",
-      "\n",
+      " \n",
       "# Variable Declaration \n",
       "\n",
       "#dry bulb temperature=25  and  wet bulb temperature=22\n",
@@ -206,8 +206,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  properties of nitrogen oxygen vapour mixture\n",
-      "\n",
+      "  \n",
       "# Variable Declaration \n",
       "\n",
       "#part(i)\n",
@@ -278,7 +277,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# properties at a temperature of 60 degree celcius\n",
+      " \n",
       "\n",
       "# Variable Declaration \n",
       "\n",
@@ -348,7 +347,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# properties if DBT is 30 and WBT is 25\n",
+      " \n",
       "\n",
       "# Variable Declaration \n",
       "\n",
@@ -421,8 +420,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# properties when dry bulb temperature is 55\n",
-      "\n",
+      " \n",
       "# Variable Declaration \n",
       "\n",
       "#part(i)\n",
@@ -485,13 +483,11 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# Calculation of final temperature\n",
+      " \n",
       "\n",
       "# Variable Declaration \n",
       "\n",
-      "#given o.03 kg of water vapour/kg of dry air is contacted with water at an adiabatic temperature and humidified and cooled to 70 percent saturtion\n",
-      "        \n",
-      "#from pyschometric chart\n",
+      " \n",
       "ft=46;                #final temperature in degree celcius\n",
       "# Calculation and Result\n",
       "print \"\\n final temperature is (from chart):%f degree celcius\"%ft\n",
@@ -528,8 +524,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  Calculation of molal humidity\n",
-      "\n",
+      " \n",
       "# Variable Declaration \n",
       "\n",
       "pa1=4.24            #data:    vapour pressure of water at 30degree = 4.24 kpa\n",
@@ -612,8 +607,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# Calculation of relative humidity and humid volume\n",
-      "\n",
+      " \n",
       "# Variable Declaration \n",
       "\n",
       "#part(i)\n",
@@ -691,8 +685,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  Calculation of film coefficient and make up water\n",
-      "\n",
+      " \n",
       "# Variable Declaration \n",
       "\n",
       "%pylab inline\n",
@@ -879,12 +872,8 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  Calculation of the make up water needed and the velocity of air\n",
-      "\n",
-      "# Variable Declaration \n",
-      "\n",
-      "#air leaves at 19 degree at fully saturated condition\n",
-      "\n",
+      " \n",
+      " \n",
       "T1=30.;              #temperature at the inlet in degree celcius\n",
       "T2=17.;              #temperature at the exit in degree celcius\n",
       "f=100000.;           #flow rate of water in kg/hr\n",
@@ -940,11 +929,9 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# Calculation of the length of the chamber\n",
+      " \n",
       "import math\n",
-      "#horizontal spray with recirculated water . air is cooled and humidified to 34 and leaves at 90percent saturation\n",
-      "\n",
-      "# Variable Declaration \n",
+      " \n",
       "\n",
       "T1=65;              #dry bulb temperature at the inlet in degree celcius\n",
       "f=3.5;           #flow rate of air in m**3/s\n",
diff --git a/Elements_Of_Mass_Transfer_Part_1/ch6.ipynb b/Elements_Of_Mass_Transfer_Part_1/ch6.ipynb
index ab63d6e7..d6c3df87 100644
--- a/Elements_Of_Mass_Transfer_Part_1/ch6.ipynb
+++ b/Elements_Of_Mass_Transfer_Part_1/ch6.ipynb
@@ -1,6 +1,7 @@
 {
  "metadata": {
-  "name": ""
+  "name": "",
+  "signature": "sha256:a29072d0985b8dbf41dbd6153642bf709b504655904069bc08292ea01d2d0ef9"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -27,10 +28,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# Calculation of the solid temp\n",
-      "\n",
-      "# Variable Declaration  \n",
-      "#air leaves the pre-heater of the dryer at 325K\n",
+      " \n",
       "\n",
       "H1=.005;                        #humidity of incoming air per kg of dry air\n",
       "T1=25.;                          #wet bulb temperature\n",
@@ -89,9 +87,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# time for drying\n",
-      "# Variable Declaration  \n",
-      "\n",
+      " \n",
       "%pylab inline\n",
       "#table    X*100,(kgmoisture/kg dry solid)   N*100 (kg moisture evaporated /hr*m**2)\n",
       "                \n",
@@ -174,8 +170,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# plots of drying rate curve\n",
-      "\n",
+      " \n",
       "#part(i)\n",
       "#table wt of wet slab,kg  -- 5.0   4.0   3.6   3.5  3.4  3.06  2.85\n",
       "#      drying rate,kg/m**2s-- 5.0   5.0   4.5   4.0  3.5  2.00  1.00\n",
@@ -247,8 +242,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  total time for drying\n",
-      "\n",
+      " \n",
       "# Variable Declaration  \n",
       "#part(ii)\n",
       "w1=5.;                           #wet of wet solid\n",
@@ -305,10 +299,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  time for drying the sheets\n",
       "\n",
-      "#table X-- .30   .20   .18   .15  .14  .11  .07  .05\n",
-      "#      N-- 1.22  1.22  1.14  .90  .80  .56  .22  .05\n",
       "#let Ls/A=p\n",
       "# Variable Declaration  \n",
       "p=48.;                   #mass of bone dry solid ais the drying surface\n",
@@ -377,26 +368,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  Calculation and plot of drying rates\n",
-      "\n",
-      "#table 6.5.1\n",
-      "#S.NO.       Time (Hr)                   weight of wet material(kg)\n",
-      "#                0.0                                    5.314\n",
-      "#                0.4                                    5.238\n",
-      "#                0.8                                    5.162\n",
-      "#                1.0                                    5.124\n",
-      "#                1.4                                    5.048\n",
-      "#                1.8                                    4.972\n",
-      "#                2.2                                    4.895\n",
-      "#                2.6                                    4.819\n",
-      "#                3.0                                    4.743\n",
-      "#                3.4                                    4.667\n",
-      "#                4.2                                    4.524\n",
-      "#                4.6                                    4.468\n",
-      "#                5.0                                    4.426\n",
-      "#                6.0                                    4.340\n",
-      "#               infinite                                4.120\n",
-      "\n",
+      " \n",
       "# Variable Declaration  \n",
       "w=[5.314,5.238,5.162,5.124,5.048,4.972,4.895,4.819,4.743,4.667,4.524,4.468,4.426,4.340,4.120]\n",
       "t=[0.0,0.4,0.8,1.0,1.4,1.8,2.2,2.6,3.0,3.4,4.2,4.6,5.0,6.0]\n",
@@ -503,8 +475,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# amount of air required\n",
-      "\n",
+      " \n",
       "# Variable Declaration  \n",
       "#part(ii)\n",
       "w1=4.934;                    #weight after two hours\n",
@@ -548,8 +519,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# actual time of the falling peroid\n",
-      "\n",
+      " \n",
       "# Variable Declaration  \n",
       "#part(iii)\n",
       "#let us choose the consistency of 11 and 13 readings\n",
@@ -597,9 +567,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  time saved in drying\n",
-      "\n",
-      "#wooden cloth is dried from 100 to 10 and then th efinal moisture content is changed to 16 percent from 10;\n",
+      " \n",
       "# Variable Declaration  \n",
       "Xcr=0.55;             #crtical moisture content\n",
       "X1=1;               #moisture content on dry basis intially\n",
@@ -651,10 +619,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# time for drying the sheets from 30 to 6 percent\n",
-      "\n",
-      "#assume rate of drying in the falling rate period is directly prporional to the free moisture content\n",
-      "\n",
+      " \n",
       "#Ls/ A*Nc is unknown;\n",
       "# Variable Declaration  \n",
       "Xcr=0.14;             #crtical moisture content\n",
@@ -705,7 +670,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  time for drying the material\n",
+      " \n",
       "# Variable Declaration \n",
       "Ls=1000.;              #mass of bone dry solid ais the drying surface\n",
       "A=55.;                 #both upper surafce and lower surface are exposed\n",
@@ -751,14 +716,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# time saved if air velocity is increased\n",
-      "\n",
-      "#tbar=(Ls/(A*Nc))*((Xcr-Xbar)*log((Xcr-Xbar)/(X2-Xbar)));\n",
-      "#part(i)\n",
-      "# assuming only surface evaporation and assuming air moves parellel to  surface\n",
-      "\n",
-      "#Nc=G**0.71;            G=V*d\n",
-      "#so NC = k* V**.71\n",
+      " \n",
       "# Variable Declaration  \n",
       "Ls=1000.;              #mass of bone dry solid ais the drying surface\n",
       "A=55.;                 #both upper surafce and lower surface are exposed\n",
@@ -810,10 +768,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# time for drying the fibreboard\n",
-      "\n",
-      "#determine the drying condition of sample 0.3*0.3 size.sheet lost weight at rate of 10**-4 kg/s until the moisture fell to 60 percent\n",
-      "# Variable Declaration  \n",
+      " \n",
       "x1=.75;                #moisture content on wet basis\n",
       "xbar=0.1;                #equilllibrium moisture on dry basis\n",
       "xcr=0.6;                #critical moisture content\n",
@@ -861,11 +816,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# time for drying the moist material\n",
-      "\n",
-      "#determine the drying condition of sample 0.3*0.3 size.sheet lost weight at rate of 10**-4 kg/s until the moisture fell to 60 percent\n",
-      "\n",
-      "#Ls/ A*Nc is unknown;\n",
+      " \n",
       "# Variable Declaration  \n",
       "Xcr=0.16;             #crtical moisture content\n",
       "X1=.33;               #moisture content on dry basis intially\n",
@@ -914,8 +865,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# time for drying the slab from 65 to 30 percent\n",
-      "\n",
+      " \n",
       "# Variable Declaration  \n",
       "d=.22;                    #density of dry pulp in g/cc;\n",
       "x1=.65;                #moisture content on wet basis\n",
@@ -964,7 +914,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  time for drying the slab\n",
+      "\n",
       "# Variable Declaration  \n",
       "d=.22;                    #density of dry pulp in g/cc;\n",
       "\n",
@@ -1015,9 +965,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  time for drying the filter cake\n",
-      "#Ls/ A*Nc is unknown;\n",
-      "\n",
+      " \n",
       "# Variable Declaration  \n",
       "import math\n",
       "Xcr=0.14;             #crtical moisture content\n",
@@ -1071,8 +1019,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  time for drying the sheets\n",
-      "# Variable Declaration  \n",
+      " \n",
       "d=450.;                    #density of dry pulp in kg/m**3;\n",
       "thickness=0.05;           #thickness in m**2\n",
       "Ls=d*thickness;           #mass of bone dry solid ais the drying surface\n",
@@ -1125,8 +1072,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# heater load per unit mass of dry air\n",
-      "\n",
+      " \n",
       "# Variable Declaration  \n",
       "t1=20.;                   #ambient air temperature \n",
       "t2=70.;                   #exhaust air temperature \n",
@@ -1192,8 +1138,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  surface area of the roller\n",
-      "# Variable Declaration  \n",
+      " \n",
       "m1=.12;                    #initial moisture content\n",
       "dT=85.;                    #product of 85 degree is used in design purpose\n",
       "U=1700.;                   #overall heat transfer coefficient\n",
@@ -1241,9 +1186,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  time for drying the sheets\n",
-      "\n",
-      "#moisture content reduces from 25 to 2\n",
+      " \n",
       "\n",
       "# Variable Declaration  \n",
       "r=7.5*10**-5;                    #constant drying rate in kg/s\n",
diff --git a/Elements_Of_Mass_Transfer_Part_1/ch7.ipynb b/Elements_Of_Mass_Transfer_Part_1/ch7.ipynb
index 0c7c641e..9dcbb1df 100644
--- a/Elements_Of_Mass_Transfer_Part_1/ch7.ipynb
+++ b/Elements_Of_Mass_Transfer_Part_1/ch7.ipynb
@@ -1,6 +1,7 @@
 {
  "metadata": {
-  "name": ""
+  "name": "",
+  "signature": "sha256:9c280dff7f4e1d5ae99e0fbadb3fa83466c67b9a415e20bbef76992fab6df294"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -27,10 +28,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# total weight of the solution\n",
-      "\n",
-      "#let x be the weight of water in the quantity of solution needed\n",
-      "# Variable Declaration  \n",
+      " \n",
       "c=.498;                #solute content afetr crystallisation\n",
       "W1=111.;                #molecular weight of CaCl2\n",
       "W2=219.;                #molecular weight of CaCl2.6H2O\n",
@@ -80,9 +78,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# percentage saturation and yield\n",
-      "\n",
-      "# Variable Declaration  \n",
+      " \n",
       "\n",
       "#part(i)\n",
       "w1=1000.;               #weight of solution to be cooled\n",
@@ -138,9 +134,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  temperature to which solution should be cooled\n",
-      "\n",
-      "# Variable Declaration  \n",
+      "   \n",
       "\n",
       "s1=19.75;              #solubility at 70 degree per 100 gm of water\n",
       "s2=16.5;              #solubility at 50 degree per 100 gm of water\n",
@@ -186,9 +180,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# percentage saturation and yield\n",
-      "\n",
-      "# Variable Declaration  \n",
+      "   \n",
       "\n",
       "#part(i)\n",
       "a1=146.;                #solubility at 70 degree\n",
@@ -243,9 +235,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  the weight of Na2SO4 hydrate crystal\n",
-      "\n",
-      "# Variable Declaration  \n",
+      "  \n",
       "\n",
       "p1=.3;                   #percentage of the solute in the solution\n",
       "w1=1000.;                 #weight of the solution taken\n",
@@ -291,9 +281,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# percentage yield of Na2CO3 hydrated crysta\n",
-      "\n",
-      "# Variable Declaration  \n",
+      "   \n",
       "\n",
       "s1=12.5;                  #solubility of Na2CO3 at 10 degree per 100 gm of water\n",
       "p1=.3;                   #percentage of the solute in the solution\n",
@@ -343,10 +331,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# percentage yield of K2CO3 hydrated crystal\n",
-      "\n",
-      "# Variable Declaration  \n",
-      "\n",
+      " \n",
       "s1=139.8;              #solubility at 80 degree per 100 gm of water\n",
       "s2=110.5;              #solubility at 20 degree per 100 gm of water\n",
       "w2=174.2;                 #molecular weight of K2CO3.10H2O\n",
@@ -393,9 +378,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# percentage yield FeSO4 hydrate crystal\n",
-      "\n",
-      "# Variable Declaration  \n",
+      "  \n",
       "\n",
       "s1=20.51;                  #solubility at 10 degree per 100 gm of water\n",
       "w2=277.85;                 #molecular weight of FeSO4.7H2O\n",
@@ -439,10 +422,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  percentage saturation and weight of Cesium chloride crystal\n",
-      "\n",
-      "# Variable Declaration  \n",
-      "\n",
+      " \n",
       "#part(i)\n",
       "a1=229.7;              #solubility at 60 degree\n",
       "a2=174.7;              #solubility at 60 degree\n",
@@ -495,9 +475,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  weight of Na2CO3hydrate needed to dissolve Na2CO3\n",
-      "\n",
-      "# Variable Declaration  \n",
+      "  \n",
       "\n",
       "s1=38.8;              #solubility at 30 degree per 100 gm of water\n",
       "s2=12.5;              #solubility at 10 degree per 100 gm of water\n",
@@ -551,9 +529,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  weight of Na2CO3 hydrated formed\n",
-      "\n",
-      "# Variable Declaration  \n",
+      "   \n",
       "\n",
       "s1=35.;                #percentage of solution\n",
       "x1=6000.;              #weight of Na2CO3 solution\n",
@@ -601,9 +577,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#  feed rate of FeSO4 hydrated crystal produced per hour\n",
-      "\n",
-      "# Variable Declaration  \n",
+      " \n",
       "\n",
       "C=1000.;                      #crystal formed in kg\n",
       "hf=26.002;                   #enthalpy of the feed at 80 degree in cal/g\n",
@@ -664,9 +638,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "# cooling water requirement\n",
-      "\n",
-      "# Variable Declaration  \n",
+      " \n",
       "\n",
       "import math\n",
       "C=800.;                       #crystal formed in kg/hr\n",