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A barometer typically consists of a sealed glass tube filled with Mercury or an aneroid capsule. In a mercury barometer, atmospheric pressure exerts force on a reservoir of mercury, causing the mercury to rise or fall in the tube, indicating pressure changes. An aneroid barometer uses a flexible metal capsule that expands or contracts with pressure changes, translating these movements into a dial reading. Both types measure atmospheric pressure to provide weather forecasts and altitude information.

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1mo ago

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