Definition: A barometer is a device that measures atmospheric pressure.
Barometer Definition
By Anne Marie Helmenstine, Ph.D., About.com Guide
This is a 'Goethe barometer' or storm glass, a type of water-based barometer. The sealed body of the glass barometer is filled with water, while the narrow spout is open to the atmosphere.
Jean-Jacques Milan, Creative Commons LicenseChemistry Glossary and Dictionary
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