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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:972acff7d45b02187de1954b7975da8c6079f6322a8b7b9b83d194bbf84a5e53"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 7 : The second law of thermodynamics"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 7.1 Page No : 137"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# Variables\n",
+ "T1 = 308 \t\t\t#K\n",
+ "T2 = 373. \t\t\t#K\n",
+ "T3 = 538. \t\t\t#K\n",
+ "\n",
+ "# Calculations\n",
+ "e1 = (T2-T1)/T2\n",
+ "e2 = (T3-T1)/T3\n",
+ "\n",
+ "# Results\n",
+ "print 'Efficiency = %.3f '%(e1)\n",
+ "print ' Efficiency = %.3f '%(e2)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Efficiency = 0.174 \n",
+ " Efficiency = 0.428 \n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 7.2 Page No : 139"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# Variables\n",
+ "T = 25 \t\t\t#C\n",
+ "T1 = 0. \t\t\t#C\n",
+ "h = 79.8 \t\t\t#cal g**-1\n",
+ "j = 4.18*10**7 \t\t\t#ergs\n",
+ "\n",
+ "# Calculations\n",
+ "Wc = (T-T1)*h/(273+T1)\n",
+ "W = (T-T1)*h*j/(273+T1)\n",
+ "\n",
+ "# Results\n",
+ "print 'Work required = %.1f cal'%(Wc)\n",
+ "print ' Work required = %.2e ergs'%(W)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Work required = 7.3 cal\n",
+ " Work required = 3.05e+08 ergs\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 7.3 Page No : 151"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "# Variables\n",
+ "import math \n",
+ "R = 1.98 \t\t\t#cal\t\t\t#mol K\n",
+ "x = 0.75\n",
+ "n = 9\n",
+ "\n",
+ "# Calculations\n",
+ "dS = -R*(n*(x/n)*math.log(x/n)+(1-x)*math.log(1-x))\n",
+ "\n",
+ "# Results\n",
+ "print 'Entropy = %.2f cal deg**-1 mole**-1'%(dS)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Entropy = 4.38 cal deg**-1 mole**-1\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file