Exploring the Possibility of Siphons Working in a Vacuum

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In summary, the Oxford dictionary is changing the definition of a siphon to remove the requirement of air pressure. However, a siphon still relies on atmospheric pressure for its maximum height, which is limited to 9.8m. In a vacuum, the maximum loop height would be 0. The liquid used in a siphon does not affect its mechanism, but it will still have a finite vapor pressure. This topic is also being discussed in another forum.
  • #1
moronthat
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The Oxford dictionary is about to change its definition of a siphon to remove the reference to air pressure as being required. Will a siphon work in a vacuum?
 
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  • #2
No the water will boil.

Although a siphon doesn't run on air pressure, air pressure still has an effect.
The main limit on a siphon is that the head of water (the distance between the surface of the upper level and the top of the siphon hoop) can't be more than the height of a column of water supported by atmopsheric pressure (ie 9.8m)
At lower pressures the maximum height of the loop will decrease and in vacuum it reaches 0
 
  • #3
I didn't say the liquid was water.
 
  • #4
moronthat said:
I didn't say the liquid was water.

Doesn't matter - it will still have a finite vapour pressure.
The mechanism of a siphon isn't air pressure - but you can't have a loop height more than the maximum column of the liquid that can be supported by air pressure.
 
  • #5
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1. How does a siphon work in a vacuum?

A siphon works by creating a pressure difference between two points in a liquid. In a vacuum, there is no atmospheric pressure to push the liquid down, so the siphon would not work in the traditional sense.

2. Is it possible for a siphon to work in a vacuum?

While a traditional siphon may not work in a vacuum, there are other types of siphons, such as a vapor pressure siphon, that can function in a vacuum by utilizing the vapor pressure of a liquid instead of atmospheric pressure.

3. What experiments have been done to test the possibility of siphons working in a vacuum?

Several experiments have been conducted, including one by Italian scientist Evangelista Torricelli in the 17th century. He found that a siphon could not function in a vacuum, but it was later discovered that his experiment did not take into account the vapor pressure of the liquid.

4. What are the potential applications of a siphon in a vacuum?

If a siphon were to work in a vacuum, it could potentially be used in scientific experiments and industrial processes that require a liquid to be moved in a vacuum environment. It could also have applications in space exploration and technology.

5. Are there any current technologies or methods that utilize siphons in a vacuum?

While there are no known technologies that use traditional siphons in a vacuum, there are technologies that use principles similar to siphoning, such as capillary action, to move liquids in a vacuum.

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