What type of instrument is used to measure atmospheric pressure?

The aneroid barometer is used to measure atmospheric pressure as well as altitude. It consists basically of an evacuated flat cylindrical closed metal box with corrugated flexible faces that are kept from collapsing together by a spring. Mercury barometers consist of a glass tube about 80 cm long,closed at one end. The barometer works by balancing the mercury in the glass tube against the outside pressure

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