miércoles, 10 de febrero de 2016

First Thermodynamics Law

First Thermodynamics Law

Where did all of this come from?

Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy. In particular, it describes how thermal energy is converted to and from other forms of energy and how it affects matter. The fundamental principles of thermodynamics are expressed in four laws.

 Now we will review the first one...

Any thermodynamic system in equilibrium has a state variable called internal energy (E). The change in internal energy equals the difference of the heat transfer into the system and the work done by the system. 
E2 - E1 = Q - W
We have emphasized the words "into" and "by" in the definition. Heat removed from a system would be assigned a negative sign in the equation. Similarly work done on the system is assigned a negative sign. 
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