# siphon

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## siphon

(sī`fən, –fŏn), tube or other enclosed conduit through which a liquid is lifted over an elevation and then emptied at a lower level. The movement of the liquid is driven primarily by the force of gravity. A siphon is typically shaped like an inverted J or U; to operate, it must discharge at a level lower than that of the liquid's surface on the intake side. The siphon must be filled before it will operate; suction is sometimes used initially to draw a liquid into a empty siphon.

## Siphon

a bent tube with legs of different lengths, through which a liquid flows from a vessel at a higher leveito a vessel at a lower level (see Figure 1). In order to start the operation, the siphon must first be filled with the liquid. The action of a siphon results from the fact that the pressure on the liquid volume filling the upper (hatched) section of the siphon applied from the direction of the upper reservoir, that is, from the left, is higher than that applied from the direction of the lower reservoir, that is, from the right. Thus, at the moment when the flow starts, the pressure on the left is equal to p0γh1 and the pressure on the right is equal to p0 - γh2, where γ is the specific weight of the liquid, p0 is the pressure on the free surface of the liquid, and h2 > h1. In this manner, when the liquid is flowing

Figure 1. Diagram of the operation of a siphon

through the siphon, a pressure is established in the upper section that is lower than p0. The greater the difference in the heights h2 - h1 and the greater the liquid’s energy loss in overcoming the resistance of the tube, the greater the pressure drop in the upper section. This circumstance limits the difference in the heights of the liquid and, consequently, the operation of the siphon; when the pressure in the flow is below a certain limit, the column of liquid is disrupted. When cold water at atmospheric pressure is being transferred by a siphon, the maximum difference in the heights is usually no more than 6 to 7 m.

## siphon

[′sī·fən]
(botany)
A tubular element in various algae.
(engineering)
A tube, pipe, or hose through which a liquid can be moved from a higher to a lower level by atmospheric pressure forcing it up the shorter leg while the weight of the liquid in the longer leg causes continuous downward flow.
(geology)
A passage in a cave system that connects with a water trap.
(invertebrate zoology)
A tubular structure for intake or output of water in bivalves and other mollusks.
The sucking-type of proboscis in many arthropods.

## siphon

, syphon
1. a tube placed with one end at a certain level in a vessel of liquid and the other end outside the vessel below this level, so that atmospheric pressure forces the liquid through the tube and out of the vessel
2. See soda siphon
3. Zoology any of various tubular organs in different aquatic animals, such as molluscs and elasmobranch fishes, through which a fluid, esp water, passes
References in periodicals archive ?
One way this can be managed is by actively and continually educating the population on the dangers of fuel siphoning and also punishing those who seize every opportunity to siphon fuel.
COMPLAINTSNakuru County Police Commander Stephen Matu says he has not received complaints on fuel siphoning since assuming office, adding that he would send his juniors to verify the reports.Apart from damaging engines and causing losses to owners of the fuel, siphoning has been blamed for the high number of road accidents involving lorries and public service vehicles on the Nairobi-Busia road.
Under the bonnet was a siphoning tool and police also recovered a hand pump.
"A lot of the offshore product is exported directly, avoiding pipelines that are the main target for siphoning aACA* also those interested in secondary and tertiary recovery of fields the risks will be limited as well, given that the mature fields that require this type of investments are in the southeast of the country where the cartels have a lower presence," Petersen said.
Police inspector Dave Allen said yesterday: "A tragic accident occurred at the farm through a siphoning procedure involving hazardous chemicals.
Siphoning is simply the flow of a liquid--in this case gasoline--caused by pressure between the source of the liquid (the fuel tank) and a discharge point, such as a break in the fuel line.
The siphoning off of huge sums in contract cash has been going on for at least a decade.
CHEEKY thieves are building up a lucrative new trade siphoning off diesel fuel from farms and lorry drivers in a scam worth hundreds of thousands of pounds a year.
CEBU CITY -- Siphoning operations on the sunken MV St.
The minister said, The money the government is using treating victims could have been directed to other activities if the victims had heeded warnings against siphoning off fuel.
"The diving operations were suspended last Friday to give way to preparations for the fuel oil siphoning operations to be conducted by a team hired by 2Go Travel," which operated the ferry, he said.
"The diving operations have to give way to the siphoning of the fuel oil from the sunken vessel, which is being conducted by a team hired by 2GO Travel (which operated the St.

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