About Temperature - A very basic (prepared for the middle school math teachers) tutorial but still useful for professionals.
Carnot cycle - Applet showing the physics processes of a Carnot heat engine by Fu-Kwun Hwang of the National Ta´wan Normal University.
A Concise History of Thermodynamics - An overview of the history/evolution of thermodynamics. This is an excerpt from a biography of J. Willard Gibbs. The overview is available from the site in MS Word or pdf/Acrobat format.
Ideal Gas Law - Applet illustrating the ideal gas law : action of a piston in a pressure chamber filled with ideal gas.