HOW THERMOMETERE WORKS
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These liquid thermometers are based on the principal of thermal expansion. When a substance gets hotter, it expands to a greater volume. Nearly all substances exhibit this behavior of thermal expansion. It is the basis of the design and operation of thermometers.
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when the temperature around the thermometer's bulb heats up, the liquid rises in the glass tube.thermometer will expand and rise in the tube.
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