Exposure of certain metals to sunlight may lead to photochemical reactions, causing oxidation or corrosion. Ultraviolet (UV) radiation can accelerate these processes, affecting the appearance and properties of the metal.
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Exposed iron reacts with oxygen and moisture in the environment, forming iron oxide, commonly known as rust. This corrosion weakens the metal, leading to degradation and loss of structural integrity.
A helical coil is a structure formed by winding a flexible material, like a tube or wire, into a spiral shape. It is commonly used in heat exchangers and other fluid systems.