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Fix isothermal compressibility calculation #342

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Merged
g-bauer merged 2 commits into from
Mar 2, 2026
Merged

Fix isothermal compressibility calculation #342

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8572384
Fix isothermal compressibility calculation
RolfStierle Feb 20, 2026
e74cfd7
CHANGELOG updated
RolfStierle Feb 20, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
## [Unreleased]
### Changed
- Automatically detect VLLEs in `BinaryPhaseDiagram`. [#341](https://github.com/feos-org/feos/pull/341)
- Correct missing minus sign for `isothermal_compressibility`. [#342](https://github.com/feos-org/feos/pull/342)

## [0.9.3] - 2026-01-26
### Added
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2 changes: 1 addition & 1 deletion crates/feos-core/src/state/residual_properties.rs
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Expand Up @@ -272,7 +272,7 @@ where

/// Isothermal compressibility: $\kappa_T=-\frac{1}{V}\left(\frac{\partial V}{\partial p}\right)_{T,N_i}$
pub fn isothermal_compressibility(&self) -> InvP<D> {
(self.dp_dv(Contributions::Total) * self.volume).inv()
-(self.dp_dv(Contributions::Total) * self.volume).inv()
}

// entropy derivatives
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