Several large PDFs from USA DOE on Thermodynamics. Look good at a quick skim. 1st one is 138 pages, so have fun. http://c3energy.com/alt_energy/ No doubt available elsewhere. Also some other interesting DOE titles plus some other energy (mainly solar) material. For those who don't need this level of detail, a simple restatement of the 3 laws of thermodynamics may suffice. 1. You can't win 2. You can't break even 3. You can't get out of the game. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist