A barometer is an instrument that measures atmospheric pressure, the weight of air pushing down on Earth's surface. It matters because changes in atmospheric pressure help predict weather patterns, such as storms or fair conditions.
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thumb|An analog barometer
A barometer is a scientific instrument that is used to measure air pressure. Pressure tendency, which is derived from barometric readings, can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs, pressure systems and frontal boundaries.
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