evaporimeter


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evaporimeter

(ĭvăp'ərĭm`ətər), instrument that measures the rate of evaporation of water into the atmosphere, sometimes called an atmometer. Evaporimeters are of two types, those that measure the evaporation rate from a free water surface and those that measure it from a continuously wet porous surface. In the first type, the level of water in a tank or pan, often sunk into the ground so that the water surface is at ground level, is measured by a micrometer gauge. After accounting for increases due to rain and decreases due to deliberate draining, the day-to-day decrease in the water level can be attributed to evaporation. In one evaporimeter of the second type, the evaporation rate is computed according to the rate of weight loss of a wet pack of absorbent material. The Piché evaporimeter uses an inverted graduated cylinder of water with a filter-paper seal at the mouth. Evaporation takes place from the wet filter paper and thus depletes the water in the cylinder, so that the rate of evaporation can be read directly from the graduations marking the water level. The Livingston sphere, another evaporimeter of the second type, uses a wet ceramic sphere as the evaporating surface to simulate evaporation rates from vegetation. Because evaporation rates are so sensitive to the water supply, and the nature of the evaporating surface, data collected by evaporimeters often do not reflect true evaporation processes; hence, evaporimeters have limited use.

evaporimeter

[i‚vap·ə′rim·əd·ər]
(engineering)
References in periodicals archive ?
Immonen, "Evaluation ofa hand-held evaporimeter (VapoMeter) for the measurement of transepidermal water loss in healthy dogs," Veterinary Dermatology, vol.
The use of the Piche evaporimeter in the calculation of evaporation.
In Brazil, there are six 20 [m.sup.2] evaporimeters; besides the tank of this research, two are located in Sao Paulo, two in Paraiba and one in Pernambuco (Leitao et al., 2007; Oliveira 2009).
Irrigation scheduling can be facilitated with soil water sensors, with model-based methods that estimate evapotranspiration using adjustments for growth stage, and with evaporimeters modified for ease of use and interpretation.
The facility has "hot" rooms (high temperature and humidity controlled) for running antiperspirant effectiveness and odor evaluation studies according to published monographs and client requirements; stability chambers consisting of nine environmentally controlled areas that provide the client with multiple options regarding accelerated stability programs; and temperature and humidity-controlled rooms to perform studies in moisturization, utilizing technologies such as Novameters, Corneometers and Evaporimeters.
solar simulators, corneometers, sebumeters, evaporimeters,