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@wikipedia

Disclaimer: Not to be confused with Compressibility factor 

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bodyZ
.

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Compressibility is related to Z-factor 

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bodyZ
 and Formation Volume Factor (FVF) 
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 as:


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anchorcZ
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c(p) = \frac{1}{p} - \frac{1}{Z} \frac{dZ}{dp}



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anchorcZ
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c(p) =  - \frac{1}{B} \frac{dB}{dp}



The most popular material compressibilities are:

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