How is air pressure measured?



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    According to an aneroid berograph is used to measure air pressure. The mercury barometer was developed in the 17th century. They are used today and many of today’s barometers use aneroids to detect air pressure. An aneroid is a flexible metal bellow that has been tightly sealed after having air removed. Higher atmospheric pressures squeeze the metal bellows while lower presure allow it to expand. The aneroid baromtere is the heart of altimeters used in modern aviation 

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