# 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 ?
Siphonic, seen as the US-based division leader, continues to train well
Aidan O'Brien's undefeated winner of seven races, including Group or Grade 1 events in four different countries, raced only once in the US, but his breathtaking win in the Breeders' Cup Juvenile was enough to earn him a rating of 126, ahead of Grade 1 winners Siphonic, Officer and Came Home.
Frankel has also mentioned sending his Santa Catalina Stakes winner Labamta Babe to Gulfstream Park for the Florida Derby rather than remain in California to face Siphonic, once again for much less prize-money.
And the winners keep coming-their latest success was at Santa Anita on Saturday, when Labamta Babe beat 1-10 favourite Siphonic to land the Grade 2 Santa Catalina Stakes.
Labamta Babe, ridden by Kent Desormeaux, received a helping hand when Siphonic stumbled from the gate, but nothing should be taken away from the winner-he was the only runner the favourite failed to catch.
At Santa Anita, Siphonic, with 8st 11lb, gave Labamta Babe 8lb.
HOT favourite Siphonic could finish only second to the Bobby Frankel-trained Labamta Babe in the Grade 2 Santa Catalina Stakes at Santa Anita on Saturday after a bad stumble at the start, writes Dan Farley.
While Siphonic went by every rival but the winner, Kent Desormeaux just had to get Labamta Babe past Cottonwood Cowboy and Major Storm, who had contested the early lead.
Conversely, Jerry Bailey, rider of Siphonic, rued: "I couldn't have asked for him to stand any better [in the stalls], but he broke so hard that the ground broke out from under him.
SIPHONIC, who ran third to Johannesburg in the Breeders' Cup Juvenile last year, takes on five rivals in the Grade 2 Santa Catalina Stakes over eight and a half furlongs at Santa Anita today.
Trained by David Hoffmans, Siphonic was an impressive winner of the Grade 1 Hollywood Futurity last time out.

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