A barometer is a scientific instrument used to measure atmospheric air pressure. While traditional barometers use a glass tube filled with toxic liquid mercury, the Aneroid Barometer measures pressure without using any liquid at all (the word 'aneroid' means 'without liquid').
Invented by French scientist Lucien Vidi in 1844.
'Aneroid' comes from Greek words meaning 'not wet'.
High pressure usually brings clear, sunny weather.
Inside the barometer is a small, flexible metal box called an aneroid cell (or capsule).
Aneroid barometers are smaller, less fragile, do not spill, and contain no toxic mercury, making them much easier to transport and use safely.
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