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Zinc - Mayo Clinic

  • OverviewEvidenceOur TakeSafety and Side EffectsInteractionsZinc, a nutrient found throughout your body, helps your immune system and metabolism function. Zinc is also important to wound healing and your sense of taste and smell. With a varied diet, your body usually gets enough zinc. Food sources of zinc include chicken, red meat and fortified breakfast cereals. People use oral zinc to help treat colds, but it can decrease the effectiveness of certain drugs and cause side effects. The recommended daily amount of zinc is 8 milligrams (mg) for women and 11 mg for adultungsten Uses, Properties, & Facts BritannicaOccurrence, properties, and uses. The amount of tungsten in Earths crust is estimated to be 1.5 parts per million, or about 1.5 grams per ton of rock. China is the dominant producer of tungsten; in 2016 it produced over 80 percent of total tungsten mined, and it contained nearly two-thirds of the worlds reserves. Vietnam, Russia, Canada, and Bolivia produce most of the remainder. Zinc Supplements:Types, Benefits, Dosage, and Side EffectsJan 10, 2019 · Zinc supplements are often used to promote skin health and treat common skin conditions like acne . Zinc sulfate has been shown to be especially useful for decreasing symptoms of severe acne ( 4 ).

    germanium Properties, Uses, & Facts Britannica

    Germanium, a chemical element between silicon and tin in Group 14 (IVa) of the periodic table, a silvery-gray metalloid, intermediate in properties between the metals and the nonmetals. It did not become economically significant until after 1945, when its properties as a semiconductor were recognized. iron - Students Britannica Kids Homework HelpEncyclopædia Britannica, Inc. The chemical element iron is the fourth most common element in Earths crust and the second most abundant metal.Iron was used by early peoples. Its chemical symbol, Fe, is taken from the Latin ferrum.The name iron is from the Anglo-Saxon iren or isern.About 5 percent of Earths crust is composed of iron. metal - Students Britannica Kids Homework HelpEncyclopædia Britannica, Inc. The physical properties of metals can be used to classify and compare metals, nonmetals, and metalloids. Most metals have a high density, or high mass per unit volume.Metals tend to have high strength, or the ability to resist being distorted from their original shape.

    wood - Students Britannica Kids Homework Help

    Wood is the hard, fibrous substance found beneath bark in the stems and branches of trees and shrubs. Practically all commercial wood, however, comes from trees. It is plentiful and replaceable. Since a new tree can be grown where one has been cut, wood is considered a renewable natural resource. www-britannica-com-science-plastic-The-polymers.pdf Properties The physical state and morphology of a polymer have a strong influence on its mechanical properties. A simple measure of the differences produced in mechanical behaviour is the elongation that occurs when a plastic is loaded (stressed) in tension. A glassy polymer such as polystyrene is quite stiff, showing a high ratio of initial stress to initial elongation.The Properties and Uses of Zinc Metal

    • Physical PropertiesThe History of ZincZinc in The MarketplaceCommon AlloysInteresting Zinc Factsbrass Definition, Properties, & Facts BritannicaThe malleability of brass depends on the zinc content; brasses that contain more than 45 percent zinc are not workable, either hot or cold. Such brasses, known as white brasses, are of little industrial importance, though a granulated form is used in brazing (soldering); they also form the basis for certain alloys used in die-casting. The malleable brasses may be further subdivided into those that can be worked cold (generally those with less than 40 percent zinc