The state of a substance when it is at the critical point, i.e., at critical temperature and pressure.
- Fractured 0.5 cm thick sections were dehydrated in a graded ethanol series, substituted in 2-methyl - 2-propanol, and lyophilized in the critical state.
- Some materials that have experienced higher stress show significantly reduced frictional strength and a pattern of behaviour inconsistent with critical state concepts.
- Soft-sediment deformation involves complex interactions between discrete fracturing and diffuse bulk strain, described in terms of volume change and shear strain in a critical state mechanics framework.
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