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atmometer

[at-mom-i-ter] /ætˈmɒm ɪ tər/
noun
1.
an instrument for measuring the rate at which water evaporates.
Also called evaporimeter.
Origin
1805-1815
1805-15; atmo- + -meter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for atmometer

atmometer

/ætˈmɒmɪtə/
noun
1.
an instrument for measuring the rate of evaporation of water into the atmosphere Also called evaporimeter, evaporometer
Derived Forms
atmometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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atmometer in Science
atmometer
  (āt-mŏm'ĭ-tər)   
An instrument that measures the rate of evaporation of water into the atmosphere. Atmometers usually measure the evaporation of water from a free water surface (such as a pan of water set into the ground so that the water's surface is even with the ground's surface) or from a porous, water-saturated surface (such as filter paper placed over a graduated cylinder of water). In the first type, the difference between the ground surface and the water level is used to calculate the volume of water that has evaporated in a given period of time. In the second type, the water volume is read directly from the graduated cylinder. Also called evaporimeter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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