atmometer

American  

[at-mom-i-ter] / ætˈmɒm ɪ tər /

noun

1. an instrument for measuring the rate at which water evaporates.

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atmometer British  

/ ætˈmɒmɪtə /

noun

1. Also called: evaporimeter.   evaporometer.  an instrument for measuring the rate of evaporation of water into the atmosphere

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atmometer Scientific  

/ ăt-mŏm′ĭ-tər /

1. 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.

2. Also called evaporimeter

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Other Word Forms

• atmometry
  noun

Etymology

Origin of atmometer

First recorded in 1805–15; atmo- + -meter