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Z-factor is related to fluid compressibility 

LaTeX Math Inline
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as:


LaTeX Math Block
anchorZ_ccZ
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c(p) = \frac{1}{p} - \frac{1}{Z} \frac{dZ}{dp}



LaTeX Math Block
anchorZ_c
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Z(p) = \frac{Z_0}{p_0} \cdot p \cdot \exp \left[ - \int_{p_0}^p c(p) dp  \right]


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titleDerivation


Content with equations:
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LaTeX Math Block
anchorcZcZder
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c = \frac{1}{\rho} \frac{d\rho}{dp}  = \frac{d \ln \rho}{dp} =  \frac{d }{dp} \left(  \ln  \left(\frac{p}{Z} \right)  \right) = \frac{Z}{p} \cdot \frac{d }{dp} \left(\frac{p}{Z} \right) = \frac{Z}{p} \cdot \left( \frac{1}{Z} + p \cdot \frac{d }{dp} \left( \frac{1}{Z} \right)   \right) = \frac{1}{p}  - \frac{1}{Z} \frac{dZ}{dp}

Rewriting Integrating 

LaTeX Math Block Reference
anchorcZ
:

LaTeX Math Block
anchorcZ
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\frac{d \ln Z}{dp} = \frac{1}{p} - c(p) \rightarrow \ln \frac{Z}{Z_0} = \ln {p}{p_0} - \int_{p_0}^p c(p) \, dp

which  one arrives to 

LaTeX Math Block Reference
anchorZ_c
.


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