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The '''First Law of Thermodynamics''' states that the increase in internal energy of a closed system equals the amount of heat energy added plus the work performed on the system.   

The '''First Law of Thermodynamics''' states that the increase in internal energy of a closed system equals the amount of heat energy added minus the work performed by the system.   

Mathematically, this is described as follows:

Mathematically, this is described as follows:

:<math>\,dU = \delta Q + \delta W\,</math>

:<math>dU=dQ-dW\,</math>

where

where

:<math>\,dU</math> is the infinitesimal increase in the internal [[energy]]

:<math>dU</math> is the infinitesimal increase in the internal [[energy]]

:<math>\delta Q</math> is the infinitesimal amount of [[heat]] added to the system

:<math>dQ</math> is the infinitesimal amount of [[heat]] added to the system

:<math>\delta W</math> is the infinitesimal amount of work performed on the system

:<math>dW</math> is the infinitesimal amount of work performed done by the system

 

A ramification of this is the [[Conservation of Energy|Principle of conservation of energy]];<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref><ref>“This law is considered the most powerful and most fundamental generalization about the universe that scientists have ever been able to make.  No one knows why energy is conserved... All that anyone can say is that in over a century and a quarter of careful measurement scientists have never been able to point to a definite violation of energy conservation, either in the familiar everyday surroundings about us, or in the heavens above or in the atoms within.” Isaac Asimov, Smithsonian Institution Journal, 1970, p.6 [http://www.trueorigin.org/steiger.asp (quoted)]</ref> the amount of energy in the [[closed system]] of the universe remains constant. This can be combined with the principle of [[e=mc^2|Mass-Energy Equivalence]] to demonstrate that the amount of mass in the [[universe]] is constant.

A ramification of this is the [[Conservation of Energy|Principle of conservation of energy]];<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref><ref>“This law is considered the most powerful and most fundamental generalization about the universe that scientists have ever been able to make.  No one knows why energy is conserved... All that anyone can say is that in over a century and a quarter of careful measurement scientists have never been able to point to a definite violation of energy conservation, either in the familiar everyday surroundings about us, or in the heavens above or in the atoms within.” Isaac Asimov, Smithsonian Institution Journal, 1970, p.6 [http://www.trueorigin.org/steiger.asp (quoted)]</ref> the amount of energy in the [[closed system]] of the universe remains constant. This can be combined with the principle of [[e=mc^2|Mass-Energy Equivalence]] to demonstrate that the amount of mass in the [[universe]] is constant.

For more information, please see: [[Atheism and the origin of the universe#Theistic implications of the 1st and 2nd laws of thermodynamics|Theistic implications of the 1st and 2nd laws of thermodynamics]]

For more information, please see: [[Atheism and the origin of the universe#Theistic implications of the 1st and 2nd laws of thermodynamics|Theistic implications of the 1st and 2nd laws of thermodynamics]]

==References==

==References==