The matter which density is not dependent on pressure pressure
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\rho(p, T) = \rho_0(T) = {\rm const} |
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c(T, p) \equiv 0 \Leftrightarrow \frac{d \rho}{ dp} = 0 |
where
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Incompressible matter does not exist but in many practical applications the pressure and temperature variations stay within the sufficiently narrow range where a given matter can be considered as incompressible.
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