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Goenning · Answer 1 · 2016-03-21T12:52:49+0000

Answer:

Barometer

Step-by-step explanation:

A barometer is an instrument which is used to measure air pressure. Air , water or mercury is used to measure air pressure by the Barometer. It helps to forecast weather conditions. A simple barometer is made of long glass tube which is open at one end and closed at another. It contains mercury and is kept upside down dipped in the mercury.

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