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Laws of Thermodynamics (Read 1737 times)
Gerrit-Jan Linker
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Laws of Thermodynamics
10.04.09 at 18:45:13
 
Laws of Thermodynamics
 
Zeroth law
The zeroth law underlies the definition of temperature.
 
If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.
 
First law
The first law mandates conservation of energy and states in particular that heat is a form of energy.  
 
Energy can neither be created nor destroyed. It can only change forms.
 
Second law
The second law states that the entropy of the universe always increases
 
dE = T dS - p dV
where:
E is the internal energy, T is temperature, S is entropy, p is pressure and V is volume.
 
The first law in words: The net change of internal energy dE equals the inflow of  energy that flows in T dS  minus the outflow of energy when the system performs work ( p dV)
 
Third law
The third law concerns the entropy of an object at absolute zero temperature, and implies that it is impossible to cool a system all the way to exactly absolute zero.
 
As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.
 
References:
http://en.wikipedia.org/wiki/Laws_of_thermodynamics
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« Last Edit: 10.04.09 at 18:51:13 by Gerrit-Jan Linker »  

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