atmometer

atmometer

[at-mom-i-ter]
noun
an instrument for measuring the rate at which water evaporates.
Also called evaporimeter.


Origin:
1805–15; atmo- + -meter

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Collins
World English Dictionary
atmometer (ætˈmɒmɪtə)
 
n
evaporimeter, Also called: evaporometer an instrument for measuring the rate of evaporation of water into the atmosphere
 
at'mometry
 
n

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American Heritage
Science Dictionary
atmometer   (āt-mŏm'ĭ-tər)  Pronunciation Key 
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.
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