Will a Vacuum-Sealed Bottle Move Forward or Backward When Opened Underwater?

  • Context: Undergrad 
  • Thread starter Thread starter basheer uddin
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Discussion Overview

The discussion revolves around the behavior of a vacuum-sealed bottle when opened underwater, specifically whether it will move backward or forward. Participants explore the implications of water pressure and the dynamics involved in this scenario, with some extending the conversation to hypothetical infinite pipes.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests that the bottle will jump "backward" towards the nozzle when opened.
  • Another participant claims it will move in the direction of its opening.
  • A participant questions if the water pressure pushes the base of the bottle without an opposite push in the other direction.
  • There is a hypothetical consideration of what would happen if an infinite pipe were used instead of a bottle.
  • Participants discuss the practicality of immersing an infinite pipe and the time it would take for movement to propagate.
  • One participant humorously suggests that both the infinite pipe and pool can be found at an "Ideal Hardware Store."
  • A later post introduces a concept involving sonoluminescence with a bubble in a pail of water, linking it back to the original topic in a creative manner.

Areas of Agreement / Disagreement

Participants express differing views on the direction of movement when the bottle is opened, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Participants do not clarify assumptions regarding the mechanics of pressure and movement, nor do they resolve the implications of using an infinite pipe in the scenario.

Who May Find This Useful

Individuals interested in fluid dynamics, physics concepts related to pressure, and those curious about hypothetical scenarios in physics may find this discussion engaging.

basheer uddin
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If we create a high vacuum in a bottle and immerse it in water and then open the cork.which way will it go ?
will the bottle move backward (towards the nozzle) or forward?
 
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It will jump "backward" (towards the nozzle), then stop.
 
It will move in the direction of its opening.
 
Ok i get it! the water pressure pushes the base and there is no opposite push on the other direction. right?
 
what if there is an infinite pipe instead of a bottle?
 
Right... (y)
 
How would you immerse an infinite pipe?
 
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And how long would you wait for results? Movement would only propagate at the speed of sound of the material.
 
ambarishsr said:
How would you immerse an infinite pipe?

In an infinite pool. You can get both down at the Ideal Hardware Store. :biggrin:
 
  • #10
gmax137 said:
In an infinite pool. You can get both down at the Ideal Hardware Store.

Put a pail of water with a bubble in the middle in the paint mixer at the right freq, and you can see your zero dimensional sonoluminescent "bottle".
 

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