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    Did you mean Poisson's ratio?
    Glossary Poisson's ratio

    measure of material's perpendicular deformation to applied force

    Poisson's ratio is a measure of how much a material deforms in directions perpendicular to the direction of applied force. When you stretch a rubber band, for example, it not only gets longer but also gets thinner. Poisson's ratio quantifies this thinning effect. For most materials, this ratio is between 0 and 0.5, where a value of 0.5 means the material volume remains constant during deformation.

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      research Strain and Strain Recovery of Human Hair from the Nano- to the Macroscale

      November 2023 in “Life”
      This study found that human hair exhibits significant deformation in its intermediate filaments under strain, with recovery taking about 1000 minutes, suggesting a self-healing period post-mechanical stress. Additionally, cuticle scales deform much less than the cortex, and the Poisson ratio aligns with soft matter properties.

      research A mechanical model of overnight hair curling

      September 2015 in “˜The œEuropean physical journal. E, Soft matter and biological physics/˜The œEuropean physical journal. E, Soft matter”
      In this study, a mechanical model was developed to describe and validate the effectiveness of overnight hair curling, suggesting that combining it with hair fixatives can maintain a desired curl for over a day.

      research Anais do V International Workshop on Rational Use of Medicines

      January 2021
      This article discusses the Graduate Program in Pharmaceutical Sciences at the University of Sorocaba and emphasizes collaborating internationally to improve health policies and practices but reports no new research findings.

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      community Is there a hidden cure out there?

       1595 upvotes 2 months ago
      There is skepticism about conspiracy theories claiming pharmaceutical companies hide cures for profit. Treatments like finasteride and dutasteride are mentioned as affordable options for hair loss.