Rusting is the process of the formation of rust, a red-orange flaky substance, on the surface of iron or iron objects when they are exposed to moist air for some time. It is a type of corrosion that occurs specifically on iron in the presence of air and moisture. The chemical formula of rust is hydrated iron (III) oxide (Fe2O3.xH2O) . Rusting is a slow process that involves the oxidation of iron in the presence of oxygen and moisture or water, resulting in the formation of iron oxide. The rusting of iron can be represented by the chemical reaction 4Fe + 3O2 → 2Fe2O3. Rusting can be prevented by methods such as painting, galvanization, and coating with chromium to keep out air and water. It is important to note that rusting is a form of corrosion specific to iron, and it results in the formation of a reddish coating on the surface of iron objects when exposed to the atmosphere.