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Equilibrium (The Zeroth Law of Thermodynamics) Two objects at the same temperature are at equilibrium and remain at equilibrium until the temperature of one of the objects changes. On the other hand, if we put two objects of different temperatures next to each other, one object heats and the other cools until both bodies reach the same temperature. The zeroth law is considered obvious and will not be discussed any further.

The Zeroth Law of Thermodynamics:

Objects at equilibrium must have the same temperatures.


(1) Toossi Reza, "Energy and the Environment:Sources, technologies, and impacts", Verve Publishers, 2005

Further Reading

El-Sayed, Y., The Thermodynamics of Energy Conversions, Elsevier Direct Science, 2003.

Cengel, Y. A., Heat Transfer: A Practical Approach, McGraw-Hill, Inc., 1998.

Rifkin, J., Entropy, The Viking Press, 1980.

El-Wakil, M/ M., Power Plant Technology, McGraw-Hill, Inc., 1984.

Energy and Buildings, Science Direct Elsevier Publishing Company. An international journal publishing articles about energy use in buildings and indoor environment quality.

Energy Conversion and Management, Science Direct Elsevier Publishing Company. This journal focuses on energy efficiency and management; heat pipes; space and terrestrial power systems; hydrogen production and storage; renewable energy; nuclear power; fuel cells and advanced batteries.

Energy and Buildings, Science Direct Elsevier Publishing Company, An international journal dedicated to investigations of energy use and efficiency in buildings.

External Links

How Things Work (http://howthingswork.virginia.edu).

How Stuff Works (http://www.howstuffworks.com).

California Energy Commission Consumer Energy Center (http://www.consumerenergycenter.org).