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aneroid barometer

noun
1.
a device for measuring atmospheric pressure, often specially calibrated for use as an altimeter, consisting of a box or chamber partially exhausted of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air.
Origin
1840-1850
1840-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for aneroid barometer

aneroid barometer

noun
1.
a device for measuring atmospheric pressure without the use of fluids. It consists of a partially evacuated metal chamber, the thin corrugated lid of which is displaced by variations in the external air pressure. This displacement is magnified by levers and made to operate a pointer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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aneroid barometer in Science
aneroid barometer
  (ān'ə-roid')   

A barometer consisting of a thin elastic disk covering a chamber that contains a partial vacuum. High atmospheric pressure pushes against the disk and causes it to bulge inward, while low pressure does not push as hard, allowing the disk to bulge outward. An aneroid barometer is smaller and more portable than a mercury barometer and, when used with a barograph, can record up to a week's worth of data. Aneroid barometers are used extensively in aviation as part of altimeters.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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8
9
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