File:Gasparo_Berti_Experiment.jpg · Wikimedia Commons · See Wikimedia Commons
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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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- Image
- Barometr, Skwer Bowiena, Sopot - panoramio.jpg
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- Commons category
- Barometers
- Commons gallery
- Barometer
- time of discovery or invention
- 1643-00-00
~35 min read
Article
31 sectionsContents
- Etymology
- History
- Baliani's siphon experiment
- Berti's vacuum experiment
- Evangelista Torricelli
- Torricelli's mercury barometer
- Blaise Pascal
- First atmospheric pressure vs. altitude experiment
- Types
- Water barometers
- Mercury barometers
- Fitzroy barometer
- Fortin barometer
- Sympiesometer
- Marine barometer
- Wheel barometers
- Vacuum pump oil barometer
- Aneroid barometers
- Barographs
- <span id="MEMS Barometers"></span>MEMS barometers
- More unusual barometers
- Applications
- Compensations
- Temperature
- Altitude
- Equation
- See also
- References
- Further reading
- Patents
- External links
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.