what are the principle of thermometer
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The materials used to make thethermos flask, namely, glass, cork and rubber between the flask and the container, are all bad conductors of heat. They don't allow the heat to flow out of the flask by conduction or convection.
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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 ofthermometers. As the temperature of the liquid in a thermometer increases, its volume increases.
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