barometer

thumb|An analog barometer

AI overview

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

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Article

31 sections

Contents

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.