http://en.wikipedia.org/wiki/Lagrangian#Explanation(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to prove pV=nRT and in order to do so one need to get lagrangian (not the math formula it seems)

Here is an explanation

http://en.wikipedia.org/wiki/Lagrangian#Explanation

why is

[tex]\frac{\delta S}{\delta \varphi _i}=0 [/tex]?

S is a point given in time and space but I guess my problem is what is

[tex] \varphi [/tex]

I guess that it is the value of the field at that point in spacetime as they write does not help me much to get what it is

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# La grangian

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