Explain in details simple barometer and its construction
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A barometer is a widely used weather instrument that measures atmospheric pressure (also known as air pressure or barometric pressure) – the weight of the air in the atmosphere. A barometer is typically a tube filled with mercury sitting upside down in a container filled with mercury (called a reservoir).
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The glass tube is sealed at one end and is filled with mercury completely. ... It is the atmospheric pressure acting on the surface of the mercury in the trough that supports the vertical mercury column. The empty space above the mercury column is called the 'Torricellian vacuum'.
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