What is a barometer?

The barometer is an instrument used to measure atmospheric pressure. It can predict weather changes. When the air pressure is high, the weather will be sunny; when the air pressure decreases, there will be wind and rain. Measurable height. For every 12 meters of elevation, the mercury column decreases by about 1 millimeter, so the height of mountains and the height of airplanes flying in the air can be measured.

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