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Bimetallic strip educational supplies

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Bulb thermometers are good for measuring temperature accurately, but they are harder to use when the goal is to control the temperature. The bimetallic strip thermometer, because it is made of metal, is good at controlling things. The principle behind a bimetallic strip thermometer relies on the fact that different metals expand at different rates as they warm up. By bonding two different metals together, you can make a simple electric controller that can withstand fairly high temperatures.
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Bimetallic Strip Demonstration | VWR

Don't have a profile? Always be ready to find and show hidden heat patterns. Measure heat generated by chemical reactions or physical changes. Demonstrates differences in heat conductivity of aluminum, brass, steel, nickel, and copper. Demonstrates how convection currents work.
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Bimetallic strip

Most substances expand as their temperature is increased and contract as the temperature is decreased. To prevent breakage, substances which must be in contact with each other should have very similar coefficients of expansion. For example, teeth and teeth fillings. You could imagine how a hot cup of coffee, or a cold ice cream bar, could crack the bone of your teeth if the filling material did not expand or contract about the same amount as did the bone. The thermostat in your home takes advantage of the different coefficients of brass and iron.
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References to a 'ring' on this page include any tubular component such as a sleeve, liner or pipe. Changing the temperature of any metal will result in a change in its dimensions. If the temperature rises the metal will grow and if it falls the volume of the metal will decrease. The relationship between temperature and growth is linear and defined by the metal's coefficient of expansion linear or volumetric , which is also known as linear and cubic expansivity.
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