http://en.wikipedia.org/wiki/Thermodynamics

http://en.wikipedia.org/wiki/Carnot_cycle

http://www.grc.nasa.gov/WWW/K-12/airplane/carnot.html  NASA Carnot Cycle

http://en.wikipedia.org/wiki/Internal_energy

http://en.wikipedia.org/wiki/Laws_of_thermodynamics

http://en.wikipedia.org/wiki/Work_(thermodynamics)