Explain the construction of a simple barometer
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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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A simple barometer consists of a long glass tube (closed at one end, open at the other) filled with mercury and turned upside down into a container of mercury. ... As air pressure increases—that is, as the air becomes heavier—it pushes more of the mercury up into the tube.
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