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what is bimetallic strip? Enplain variation of door
density of substance with chang in temporanne
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A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper, or in some cases steel and brass.
In bimetallic strip thermometers the different rates of expansion of metals when heated is used to measure the temperature! ... Bimetal strips are produced by rolling the different metal sheets one on top of the other and then heating them so that the metals bond at the joint by diffusion processes (cold welding).
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