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Elemental iron occurs in meteoroids and other low oxygen environments, but is reactive to oxygen and water.

Fresh iron surfaces appear lustrous silvery-gray, but oxidize in normal air to give hydrated iron oxides, commonly known as rust.

Because of its significance for planetary cores, the physical properties of iron at high pressures and temperatures have also been studied extensively.This iron is distributed throughout the body in hemoglobin, tissues, muscles, bone marrow, blood proteins, enzymes, ferritin, hemosiderin, and transport in plasma.The mechanical properties of iron and its alloys can be evaluated using a variety of tests, including the Brinell test, Rockwell test and the Vickers hardness test.In magnetized iron, the electronic spins of the domains are aligned and the magnetic effects are reinforced.Although each domain contains billions of atoms, they are very small, about 10 micrometres across.

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