Hi, I'm currently taking thermodynamics in second year mechanical engineering. I read previous threads on here about good textbooks, and everyone seemed to agree that Cengel's book is really good. Its the book we use in class, but at times I don't think it explains everything as fully as it could. Does anyone know of any other good resources. What about learnthermo.com? Is made by someone who has taught engineering for over 18 years, but I want to be sure that it is good before committing to it. Suggestions and opinions would be great. Thank you!