creep
In civil and mechanical engineering, the property of a solid, typically a metal, under continuous stress that causes it to deform below its yield point (the point at which any elastic solid normally stretches without any increase in load or stress). Lead, tin, and zinc, for example, exhibit creep at ordinary temperatures, as seen in the movement of the lead sheeting on the roofs of old buildings.
Copper, iron, nickel, and their alloys also show creep at high temperatures.
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