What is the use of evaporimeter?
What is the use of evaporimeter?
An atmometer or evaporimeter is a scientific instrument used for measuring the rate of water evaporation from a wet surface to the atmosphere.
How many types of evaporimeter are there?
These are commonly used for the measurement of evapotranspiration from the crop but they can also be used for measuring evaporation from the bare soil. These are of two types: drainage type and weighing type, out of which weighing type is commonly used.
What is evaporation PDF?
Evaporation can be defined as the process where liquid water is transformed into a gaseous state. Evaporation can occur only when water is available. It also requires that the humidity of the atmosphere is less than the evaporating surface (at 100 % relative humidity there is no more evaporation).
What is Pan factor?
The factor (the ratio Ep / Eo, usually called the ‘pan coefficient’) is often taken as about 1.3. That implies that there is 30% more evaporation from the small area of a pan than from a lake because of the extra heat taken in through the pan’s sides.
How do you use a Piche evaporimeter?
Hold the tube vertical, closed end downwards, and fill completely with clean distilled water. Slide the clip over the end and rotate it until the disc is central with the tube but not quite touching it. With clean, grease-free, fingers or tweezers if available, insert a new disc between the tube and the clip.
Who invented evaporimeter?
Albert Piche, in Paris, described this simple instrument in 1872, and the Signal Service was soon using evaporimeters to determine the rate of evaporation in different parts of the United States.
What is Rohwers formula?
(ii) Rohwer Formula (Developed in 1931): He considered effect of atmospheric pressure and introduced a factor (1.465 — 0.0186 B) E is rate of evaporation in inches per day. ADVERTISEMENTS: B is mean barometric reading in inches of mercury (Hg) at 32°F.
What is the formula for evaporation?
The Penman formula for the evaporation rate from a lake is simplified to the following: E 0 = 700 T m / ( 100 − A ) + 15 ( T − T d ) ( 80 − T ) ( mm day − 1 ) where Tm = T + 0.006h, h is the elevation (metres), T is the mean temperature, A is the latitude (degrees) and Td is the mean dew-point.
What is evaporator and its types?
Plane evaporators consist of a plate and frame heat exchanger and are mainly used in the food and beverage industry. Plate evaporator is a type of evaporator in which a thin film of liquid is passed and flows between the plates for the process of evaporation.
What is open pan evaporimeter?
Pan Evaporimeter Instruments, Open Type that measures the rate of evaporation of water into the atmosphere, sometimes it is called an Atmometer. Evaporation rates are so sensitive to the water supply and the nature of the evaporating surface.
How is evaporation calculated?
Divide the volume of liquid that evaporated by the amount of time it took to evaporate. In this case, 5 mL evaporated in an hour: 5 mL/hour.
What is Pan evaporimeter?
(I) USWB Class-A Pan Evaporimeter: (1) The standard USWB Class-A pan evaporimeter is the most widely used evaporimeter in the world for finding evaporation from the free water surface. (2) It consists of a 121.5 cm diameter and 25.4 cm deep pan made of 20 gauge galvanized iron sheet with a stilling well.