describe about barometer
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A barometer is a scientific instrument used to measure air pressure
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rAn altimeter is intended to be used at different levels matching the corresponding atmospheric pressure to the altitude, while a barometer is kept at the same level and measures subtle pressure changes caused by weather.
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Italian physicist, Evangelista Torricelli (1608-47) invented the barometer. It is an instrument for measuring atmospheric pressure. The common unit, in which atmospheric pressure is usually mentioned in one atmosphere. It is the average pressure, which is exerted by the atmospheric pressure, at the sea levelit is equal to the pressure exerted by a column of Mercury height 76 cm and temperature of zero degree celsius when it is kept at sea level.
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