Companion site to the textbook by J. W. Tester and M. Modell, includes answers to selected problems and current errata.

A very basic (prepared for the middle school math teachers) tutorial but still useful for professionals.

Thermodynamics and heat transfer in Internal combustion engine. Applets are used to perform simple calculations. Developed at Colorado State University.

Online book on Thermodynamics at UC Berkeley.

Applet showing the physics processes of a Carnot heat engine by Fu-Kwun Hwang of the National Taïwan Normal University.

Applet illustrating the ideal gas law : action of a piston in a pressure chamber filled with ideal gas.

A qualitative introduction to the second law and entropy written for beginners in chemistry but useful for physics students too. Explains relationship with Murphy's Law.

Contains directions for making toys with thermodynamics background.

About.com's index to thermodynamics information.

Definition and short explanations of terms, units and basic principles.

from Engineers Edge. A definitions, short explanations and conection of basic thermodynamics therms.

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.

web page of the division of the Eindhoven University of Technology which study processes where fluid flows and heat transfer play a prominent role.

Classical, Quantum, Nanoscale and Statistical Thermodynamics and Mechanics data and property calculation sites.

Comprehensive converter of different physical units, including thermodynamics.

TEST is a visual environment to solve thermodynamics problems, pursue what-if scenarios and perform numerical experiments.

Lecture notes and problems from University of Pittsburg.

Collection of educational sites explaining all aspects of thermodynamics.

from HyperPhysics portal. This is rather a comprehensive online physics handbook containing "Thermodynamics" chapter. Site has a handle navigation, good illustrations, and very detail content.