Temperatures can be meassured based on the principle of different thermal expansion of solids. For this purpose, two metal strips e. When heated, the metal strip deforms due to the different degrees of expansion. The deformation is a measure of the temperature and can be read off a calibrated scale. 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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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. The strips are joined together throughout their length by riveting , brazing or welding.