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Atmometer

 
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The atmometer or evaporimeter is a scientific instrument
Measuring instrument

In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantity of real-world object and phenomenon....
 used for measuring the rate of evaporation
Evaporation

Evaporation is the slow vaporization of a liquid and the reverse of condensation. A type of phase transition, it is the process by which molecules in a liquid State of matter spontaneously become gaseous ....
 from a wet surface to the atmosphere
Atmosphere

An atmosphere is a layer of gases that may surround a material body of sufficient mass, by the gravity of the body, and are retained for a longer duration if gravity is high and the atmosphere's temperature is low....
 and invented by the Scottish
Scotland

conventional_long_name = ScotlandAlba|common_name= Scotland|image_flag = Flag of Scotland.svg|flag_width = 130px...
 mathematician and engineer Sir John Leslie.

A simple set up may be made by use of a porous
Porosity

Porosity is a measure of the void spaces in a material, and is measured as a fraction, between 0?1, or as a percentage between 0?100%. The term is used in multiple fields including ceramics, metallurgy, materials, manufacturing, earth sciences and construction....
 flat plate-like object (a filter paper
Filter paper

Filter paper is a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine solids from liquids or air....
, for example) which can draw water from an easily measurable source (a graduated cylinder
Graduated cylinder

A graduated cylinder is a piece of laboratory equipment used to accurately measure out volumes of objects for use in labs. They are generally more accurate and precise for this purpose than flasks and beakers....
, for example) via a wick of some sort.






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Atmometer
The atmometer or evaporimeter is a scientific instrument
Measuring instrument

In the physical sciences, quality assurance, and engineering, measurement is the activity of obtaining and comparing physical quantity of real-world object and phenomenon....
 used for measuring the rate of evaporation
Evaporation

Evaporation is the slow vaporization of a liquid and the reverse of condensation. A type of phase transition, it is the process by which molecules in a liquid State of matter spontaneously become gaseous ....
 from a wet surface to the atmosphere
Atmosphere

An atmosphere is a layer of gases that may surround a material body of sufficient mass, by the gravity of the body, and are retained for a longer duration if gravity is high and the atmosphere's temperature is low....
 and invented by the Scottish
Scotland

conventional_long_name = ScotlandAlba|common_name= Scotland|image_flag = Flag of Scotland.svg|flag_width = 130px...
 mathematician and engineer Sir John Leslie.

A simple set up may be made by use of a porous
Porosity

Porosity is a measure of the void spaces in a material, and is measured as a fraction, between 0?1, or as a percentage between 0?100%. The term is used in multiple fields including ceramics, metallurgy, materials, manufacturing, earth sciences and construction....
 flat plate-like object (a filter paper
Filter paper

Filter paper is a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine solids from liquids or air....
, for example) which can draw water from an easily measurable source (a graduated cylinder
Graduated cylinder

A graduated cylinder is a piece of laboratory equipment used to accurately measure out volumes of objects for use in labs. They are generally more accurate and precise for this purpose than flasks and beakers....
, for example) via a wick of some sort. As water evaporates from the surface, it tends to draw more water from the source through the wick by capillary action
Capillary action

Capillary action, capillarity, capillary motion, or wicking refers to two phenomena:# The movement of liquids in thin tubes...
 to replace the water lost by evaporation. By periodic measurements of the quantity of water remaining in the graduated cylinder, a rate of evaporation can be established. Also, using the surface area of the plate, we can establish a rate of evaporation per unit area.

External links

  • -detailing use of modern Atmometer design in irrigation
  • -.pdf file detailing modified atmometer and use


See also

  • Lysimeter
    Lysimeter

    A lysimeter is a measuring device which can be used to measure the amount of actual evapotranspiration which is released by plants, usually crops or trees....
  • Pan evaporation
    Pan evaporation

    Pan evaporation is a measurement that combines or integrates the effects of several climate elements: temperature, humidity, solar radiation, and wind....
  • Hook gauge evaporimeter
    Hook gauge evaporimeter

    A Hook gauge evaporimeter is a precision instrument used to measure changes in water levels due to evaporation. The device consists of a sharp hook suspended from a micrometer cylinder, with the body of the device having arms which rest on the rim of a still well....