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About Temperature
What is temperature and an introduction to heat and thermodynamics. Easy to understand.

Advanced Thermodynamics of Cooling
From your About.com Guide, about exergy and anergy in refrigeration and air conditioning cycles.

Basic Cycles and Components
Introduction to thermodynamic cycles (refrigeration, steam power, gas turbine, internal combustion engine) and their fundamental components (turbine, compressor, combustion chamber, pump).

Chemical Equilibria
From Bemidji State University, introduction to chemical equilibria, the four aspects of every equilibrium, equilibrium constants and equilibrium constant expressions, and determination of values of equilibrium constants.

Chemical Equilibrium
A concise introduction to chemical equilibrium and the equilibrium constant.

Chemical Equilibrium and the Constant K
From the University of South Carolina, free energy G and chemical equilibrium, equilibrium constant K, and the relationship between G and K.

CODATA Key Values for Thermodynamics
Table with internationally agreed values for the standard enthalpy of formation at 298.15 K, the entropy at 298.15 K, and the change of enthalpy between 0 and 298.15 K of key chemical substances.

Demonstrations of Everyday Live Applications...
...of the first and second laws of thermodynamics: wrecking ball, ballistic pendulum, hot balloons, adiabatic cooling, thermometers, air conditioning, and more. From John Pratte.

DIPPR Database
Extensive database of pure component property data on industrially-important chemical compounds. Web site gives information about format and pricing as well as a sample of the web interface.

Don't Gamble With Physical Properties For Simulation
Article by Eric Carlson that discusses criteria you can use to choose thermodynamic models for phase equilibria calculations. Adobe PDF file (233 kB).

Equations of State II
From David Young, ideal gas law, van der Waals equation, Clausius equation, virial equation, Peng-Robinson equation, Beattie-Bridgeman equation, Benedict-Webb-Rubin equation, and more.

Equations of State/Property Models
From the University of Florida, lecture notes on ideal gas, principle of corresponding states, cubic equations of state based on van der Waals, equations of state based on virial expansion, table with recommendations of use for different equations of state.

Exergy Analysis
Theoretical background (long), research, publications, and discussion page from the Laboratory of Thermal Engineering at the University of Twente.

The Expert System for Thermodynamics
From Subrata (Sooby) Bhattacharjee, expert system written in Java and HTML for assisting students and professionals with problem solving in Engineering Thermodynamics.

FACT-Web
Free but limited online access to the FACT pure substances inorganic database, chemical reactions, and Gibbs energy minimization calculations.

Gas-Vapor Phase Equilibrium Calculations
A mini-tutorial that discusses the calculation of dew-point temperatures and pressures in gas-vapor systems.

Henry's Law Constants (Solubilities)
List of data for more than 500 species in water. Available in postscript format, subdivided into small files, or as a plain ASCII text file.

How Cold You Can Get Your Beer
From Christopher M. A. Haslego's Chemical Engineering in Everyday Live, calculation of the freezing point depression of beer.

How to Read Phase Diagrams
What you need to know about phase diagrams of pure substances.

How to Read Pressure-Enthalpy Diagrams
What you need to know about pressure-enthalpy diagrams.

IAPWS 95 Online Calculator
Saturation pressure and properties of water in the temperature range from 0.1 to 200 °C, JavsScript/Java.

K&K Associates - Thermophysical Data
Download free databases with thermophysical properties of materials.

Lecture Notes on Thermodynamics
Jon Lee's lecture notes on the first law of thermodynamics, PVT behavior of pure substances, flow processes and heat capacity, and reversible and irreversible processes.

Molecular Model for an Ideal Gas
Verify the ideal gas law by doing experiments with this Java applet by Fu-Kwun Hwang.

On-Line Gas Density Calculation
Calculation of gas density and specific volume for a given compressibility factor.

The Page of Entropy
From Dave Slaven, introduction to entropy and energy, the second law of thermodynamics, and entropy and disorder.

Performance of a Power Cycle
Demonstration of a numerical simulation using the Device Modeling Environment developed at the Knowledge Systems Laboratory at Stanford University.

Psychrometric Calculator
Online calculation of the properties of moist air in SI units (Java). There's also a version with English units.

The Second Law of Thermodynamics
From Prof. Frank L. Lambert, how the second law affects our world of energy and matter, a tutorial in questions & answers form both for beginners and pros.

Steam Tables
Tables with properties of water and steam.

TBS-EOS Calculator
Java applet to calculate the compressiblity factors of liquid and vapor phases using the Trebble-Bishnoi-Salim cubic equation of state. Note that the description is given below the input mask.

Temperature Conversion Calculator
Online conversion of Kelvin, Celsius, Fahrenheit, Réamur, and Rankine.

ThermoChemical Calculator
Thermochemical calculations for ideal gas mixtures, e.g. cycle analysis, chemical equlibrium, stirred reactor kinetics, and mixture thermodynamic and transport properties. Username is arbitrary and only needed for storage of temporary files.

Thermodynamic Properties Page
From Quest Consultants, thermodynamic property calculations using Peng-Robinson Equation of State. Max. 10 components. Input via html forms.

Thermodynamic Property Calculator
Calculate density, enthalpy, entropy and other thermodynamic properties. Select a substance and an amount (default 1 kg), specify 2 property values in the "New Values" column and press "Calculate". Currently only for water and nitrogen.

Thermodynamics Online Help
From Taftan Data, tutorial in MS Windows help format (138 kB) covering the laws of thermodynamics, heat engines, turbines, heat exchangers, energy, power, heat, and the basic properties of pure fluids.

Thermodynamics of Phase Diagrams
Part of a materials science and engineering team class project at Virginia Tech about free energy and composition, reference states, and activity and free energy.

Thermo Explorer
Java applet that accepts component names and returns data for that component: molecular weight, normal boiling and freezing point, critical constants, acentric factor, dipole moment, and liquid density.

Thermophysical Properties of Fluid Systems
Accurate thermophysical properties for 16 fluids: density, specific volume, Cp, Cv, enthalpy, internal energy, entropy, sound speed. From the NIST Standard Reference Database Number 69 - March 1998 Release.

Utility Applets for Engineers & Scientists
From Subrata (Sooby) Bhattacharjee, Java applets for unit conversion, compressibility and psychrometric (A/C) charts, steam, refrigerants, ammonia, and ideal gas tables.

Virtual Laboratory: Thermodynamic Equilibrium
From the University of Oregon, online experiments (Java applet) demonstrating the diffusion process which occurs when gases of different temperatures are mixed.