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atmometer

Definitions

  • WordNet 3.6
    • n atmometer an instrument that measures rate of evaporation of water
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Webster's Revised Unabridged Dictionary
    • n Atmometer An instrument for measuring the rate of evaporation from a moist surface; an evaporometer.
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Century Dictionary and Cyclopedia
    • n atmometer An instrument, invented by Sir John Leslie, for measuring the amount of evaporation from a humid surface in a given time; an evaporometer. It consists of a thin hollow ball of porous earthenware, to which is joined a graduated glass tube. The ball and the tube are filled with water, the top of the tube is closed, and the instrument is exposed to the free action of the air. As the water transudes through the porous substance, and is removed in the form of vapor by the air, the extent of evaporation is shown by the sinking of the water in the graduated tube.
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Chambers's Twentieth Century Dictionary
    • n Atmometer at-mom′e-tėr an instrument for measuring the rate of evaporation from a moist surface.
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Etymology

Webster's Revised Unabridged Dictionary
Gr. smoke, vapor + -meter,: cf. F. atmomètre,
Chambers's Twentieth Century Dictionary
Gr. atmos, vapour, and Meter.