Tin cry

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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 [ citation needed ], indium, [2] zinc [ citation needed ], cadmium, [3] gallium [ citation needed ], and solid mercury [4]

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  1. "Video of the demonstration". University of Cambridge . Archived from the original on 23 February 2014. Retrieved 15 February 2021.
  2. "LibreTexts, Chemistry, Chemistry of Indium".
  3. "LibreTexts, Chemistry, Chemistry of Cadmium".
  4. Reeder, Cody (17 Mar 2015). Bending Solid Mercury: It Cries! . Retrieved 3 December 2021.