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Gallium and indium alloys are synthesized into liquid metals to form a solid solution alloy, which can become liquid at room temperature. The surface tension is 500 millinewtons per meter. This means that when this alloy is placed on a flat table without external force, it will keep an almost perfect sphere unchanged. When stimulated by a small amount of current, the surface tension of the sphere will be reduced, and the metal will stretch on the desktop. If the charge changes from negative to positive, the liquid metal will become spherical again. Changing the voltage can also adjust the metal surface tension and the viscosity of the metal block, so that they become different structures. This research can also be used to help repair the severed nerves in humans to avoid long-term disability. Researchers claim that this breakthrough will help to build better circuits and self repairing structures.

Indium is a silvery gray, very soft, fusible metal. The melting point is 156.61 ℃. The boiling point is 2060 ℃. The density is 7.30g/cm3. Liquid indium can soak glass and stick to the contacted surface, leaving black traces.

Indium has weak radioactivity. Natural indium has two main isotopes, In-113 is a stable nuclide, and In-115 is a stable nuclide β- Decay. Therefore, avoid direct contact as much as possible in use.