What are the beneficial uses of mercury ?
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Mercury metal has many uses. Because of its high density, it is used in barometers and manometers. Because it has a high rate of thermal expansion that is fairly constant over a wide temperature range, it is used extensively in thermometers. Mercury is important as a liquid contact material for electric switches.
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it is used in thermometer to measure the temperature due to its lustrous property it is used in thermometer and is visible it doesn't stick to the side of thermometer so we measure the temperature
GovindKrishnan:
low boiling point
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