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the claim

Certain materials become less dense as external pressure increases

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that certain materials become less dense as external pressure increases?

Yes. Certain materials exhibit anomalous mechanical properties, such as negative linear compressibility, causing specific dimensions or axes to expand as external pressure increases.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

Several retrieved papers document the phenomenon of negative linear compressibility (NLC) in various crystals and organic salts, where specific crystallographic axes expand rather than contract under external hydrostatic pressure. Therefore, the claim is supported by multiple empirical sources.

Evidence for · 4
Colossal Negative Linear Compressibility in Porous Organic Salts.
2020
The study demonstrates negative linear compressibility in a crystalline porous organic salt, where dimensions expand under hydrostatic compression.
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Zhao, Y., Fan, C., Pei, C., Geng, X., Xing, G., Ben, T., & Qiu, S. (2020). Colossal Negative Linear Compressibility in Porous Organic Salts.. doi.org. https://doi.org/10.1021/jacs.9b13274

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More for · 3
Anomalous mechanical materials squeezing three-dimensional volume compressibility into one dimension
2020
The paper discusses materials exhibiting negative linear compressibility, allowing them to expand in specific dimensions under pressure.
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Jiang, X., Molokeev, M., Dong, L., Dong, Z., Wang, N., Kang, L., Li, X., Li, Y., Tian, C., Peng, S., Li, W., & Lin, Z. (2020). Anomalous mechanical materials squeezing three-dimensional volume compressibility into one dimension. doi.org. https://doi.org/10.1038/s41467-020-19219-5

Effects of composition on crystal structure, thermal expansion, and response to pressure in ReO3-type MNbF6(M = Mn and Zn)
2019
The research notes that rhombohedral MnNbF6 displays negative linear compressibility below approximately 3.5 GPa.
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Hester, B. R. & Wilkinson, A. (2019). Effects of composition on crystal structure, thermal expansion, and response to pressure in ReO3-type MNbF6(M = Mn and Zn). doi.org. https://doi.org/10.1016/J.JSSC.2018.10.022

Negative Linear Compressibility and Interlayer Gap Closure in Layered Rare-Earth Hydroxyhalide (YCl(OH)2) under High Pressure.
2024
The study observes negative linear compressibility along the b-axis of YCl(OH)2 under high pressure.
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Wu, M., Xu, J., Zhang, D., Zhou, Y., Chen, W., Zhang, S., Zhong, Q., & Fan, D. (2024). Negative Linear Compressibility and Interlayer Gap Closure in Layered Rare-Earth Hydroxyhalide (YCl(OH)2) under High Pressure.. doi.org. https://doi.org/10.1021/acs.inorgchem.3c03909

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What does the evidence say?

Several retrieved papers document the phenomenon of negative linear compressibility (NLC) in various crystals and organic salts, where specific crystallographic axes expand rather than contract under external hydrostatic pressure. Therefore, the claim is supported by multiple empirical sources.

Receipt History
first checked06 Aug 2026
judged → SUPPORTED · 8406 Aug 2026
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