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thermodynamic equation relating state variables in thermodynamic equilibrium which describe the state of matter under a given set of physical conditions, such as  pressure 

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bodyp
, density 
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body\rho
 (or  compressibility factor 
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bodyZ
)
temperature 
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bodyT
 or 
internal energy 
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bodyU
 and chemical structure.It usually takes following forms:


The most general form is:


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f(p, T, V_m) = 0

where

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bodyT

temperature

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bodyp

pressure

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bodyV_m

molar volume


Alternative forms

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anchorrho
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\rho = \rho (p,T)



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Z = Z(p,T)



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p = p(\rho,T)


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