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  this demonstration uses a bimetallic strip to illustrate the differences in the thermal expansion coefficients of different materials. The earliest surviving bimetallic strip was made by the eighteenth-century clockmaker john harrison who is generally credited with its invention. He made it for his third marine chronometer (h3) of 1759 to compensate for temperature-induced changes in the balance spring. It should not be confused with the bimetallic mechanism for correcting for thermal expansion in his gridiron pendulum.   demonstration of thermal expansion through use of a bimetallic strip. Because there are two metals attached, each which heats at a different rate, the more rapidly expanding one will push the.   a bimetallic strip is made of metal which has coefficient of thermal expansion is equal to 1 and the others is equal to 2 at the temperature of t 0. L length of bimetallic strip (m) dt temperature difference (o c) t thickness of bimetallic strip (m) example - bending of bi-metal strip. Thermal properties thermal expansion expansion and contraction thermo-fluids thermal expansion and contraction () bi-metallic strips the principle behind a bimetallic strip is that different metals expand to different extents with temperature changes. By combining two different metals one on top of another into a strip, a bimetallic strip is formed. Two sheets of metals with different coefficients of thermal expansion are bonded together. This phenomenon has many applications including thermal switches and thermometers. Most bimetallic strips use a high thermal expansion alloy such as steel or stainless steel coupled with a low thermal expansion alloy such as invar. Steel and copper or in some cases, brass is also used instead of copper for bimetallic strips. 40 shows the configuration of bimetallic temperature controlled switch or thermostat. Thermal expansion from the thermodynamics part of the hyperphysics website based at georgia state university. Includes a section on bimetallic strips, with a video clip of a bimetallic strip being dipped into liquid nitrogen. Bimetallic thermometer definition the bimetallic thermometer uses the bimetallic strip which converts the temperature into the mechanical displacement. The working of the bimetallic strip depends on the thermal expansion property of the metal. The thermal expansion is the tendency of metal in which the volume of metal changes with the variation in temperature.

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