Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsWork and Efficiency of a Stirling Enginehttp://demonstrations.wolfram.com/WorkAndEfficiencyOfAStirlingEngine/]]>http://demonstrations.wolfram.com/WorkAndEfficiencyOfAStirlingEngine/