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The liquefied metal expanding on solidification is
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$\mathrm{Ga}$
Gallium is brittle at low temperature but is liquid above room temperature and can indeed melt in the hand.
Gallium metal expands by 3.1 percent when it solidifies, and therefore should not be stored in either glass or metal containers. Gallium also corrodes most other metals by diffusing into their metal lattice.
Gallium metal expands by 3.1 percent when it solidifies, and therefore should not be stored in either glass or metal containers. Gallium also corrodes most other metals by diffusing into their metal lattice.
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