Tin cry

Short description: Sound made by bending tin

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File:Zinnschrei.webm Tin cry is the characteristic sound heard when a bar made of tin is bent. Variously described as a "screaming" or "crackling" sound, the effect is caused by the crystal twinning in the metal.[1] The sound is not particularly loud, despite terms like "crying" and "screaming". It is very noticeable when a hot-dip tin-coated sheet metal is bent at high speed over rollers during processing.

Tin cry is often demonstrated using a simple science experiment. A bar of tin will "cry" repeatedly when bent until it breaks. The experiment can then be recycled by melting and recrystallizing the metal. The low melting point of tin, 231.9 °C (449.4 °F; 505.0 K), makes re-casting easy. Tin anneals at reasonably low temperature as well, normalizing tin's microstructure of crystallites/grains.

Although the cry is most typical of tin, a similar effect occurs in other metals, such as niobium,[2] indium,[3] zinc,[2] cadmium,[4] gallium,[2] and solid mercury.[5]

## References

1. ↑ "Video of the demonstration". http://www.doitpoms.ac.uk/ldplib/acoustic/video.php.
2. ↑ 2.0 2.1 2.2 "Deformation twinning in low symmetry metals (all content)". https://www.doitpoms.ac.uk/ldplib/acoustic/printall.php.
3. ↑ "LibreTexts, Chemistry, Chemistry of Indium". 2 October 2013. https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_and_Websites_(Inorganic_Chemistry)/Descriptive_Chemistry/Elements_Organized_by_Block/2_p-Block_Elements/Group_13:_The_Boron_Family/Z049_Chemistry_of_Indium_(Z49).
4. ↑ "LibreTexts, Chemistry, Chemistry of Cadmium". 2 October 2013. https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_and_Websites_(Inorganic_Chemistry)/Descriptive_Chemistry/Elements_Organized_by_Block/3_d-Block_Elements/Group_12:_Transition_Metals/Chemistry_of_Cadmium.
5. ↑ Reeder, Cody (17 Mar 2015). Bending Solid Mercury: It Cries!. Retrieved 3 December 2021.

## External links

* Tin cry on YouTube
* Mercury cry on YouTube

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