• cmd5403
In summary, the conversation discusses the physical possibility of syphoning a liquid from a pool of water back to itself. Variables such as acceleration due to gravity, change in height, surface tension, air pressure, friction, and radius are mentioned. It is suggested that by removing all air from the tube and setting both ends at the same height, a force could be applied to get the liquid flowing continuously due to the vacuum created. However, it is acknowledged that this would require disregarding friction, which is not possible in reality. The possibility of using a superfluid is also considered, but it is noted that even this would not work due to the "fountain effect" being driven by thermal radiation. The conversation concludes that this concept would not
cmd5403
Is it physically possible to syphon a liquid from a pool of water back to itself?

My thoughts: Variables involved are acceleration due to gravity, change in height, surface tension, air pressure, friction, radius inside and vacuums. If you take all the air out of the tube and place both ends below the surface of the liquid, the pressure at the ends, the radius, and the surface tension don't matter. Setting both ends at the same height means there's no acceleration. In this kind of system, it seems to me like all you would have to do is apply a force to get the liquid going, and it would keep flowing forever (disregarding friction) due to the vacuum created.

idk, though. What do you think?

You would of course need to disregard friction as you say to get the unphysical result that you desire. Might work for a while with a super fluid. Maybe.

Yes, lots of things could go around in a circle forever if there were no friction.

John Creighto said:
You would of course need to disregard friction as you say to get the unphysical result that you desire. Might work for a while with a super fluid. Maybe.

It won't work even with a superfluid. The "fountain effect" that is often demonstrated using superfluid helium comes close, but is actually driven by thermal radiation from the environment.

I think I see why it wouldn't work. Any low pressure caused by the moving fluid could be filled from either end.

1. What is a syphon?

A syphon is a simple device used to transfer liquids from one container to another using gravity and atmospheric pressure.

2. How does a syphon work?

A syphon works by filling the syphon tube with liquid and then creating a pressure difference between the two ends of the tube. This pressure difference causes the liquid to flow from the higher end to the lower end, allowing it to be transferred to another container.

3. Can a syphon work with any type of liquid?

Yes, a syphon can work with any type of liquid as long as it is able to flow through the tube and there is a difference in height between the two ends of the tube.

4. What are some practical applications of syphons?

Syphons have a wide range of practical applications, including draining water from a pool, transferring fuel from one container to another, and even in medical procedures such as blood transfusions.

5. Are syphons still used in modern technology?

Yes, syphons are still used in modern technology, particularly in industries such as agriculture, automotive, and chemical manufacturing. They are also used in everyday items such as kitchen sinks and toilets.

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