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TeachMeFinance.com - explain Barometer Barometer The term 'Barometer' as it applies to the area of Earth observation can be defined as ' An instrument used to measure atmospheric pressure. A standard mercury barometer has a glass column about 30 inches long, closed at one end, with a mercury-filled reservoir. Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir. High atmospheric pressure forces the mercury higher in the column. Low pressure allows the mercury to drop to a lower level in the column. An aneroid barometer uses a small, flexible metal box called an aneroid cell. '. The term 'Barometer' as it applies to the area of the weather can be defined as ' An instrument that measures atmospheric pressure'. Previous 5 Terms: barodynamics Barogram Barograph barograph barology Next 5 Terms: barometer Barometric Pressure barometric pressure baroscope Barotropic System About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.