Compressed Chamber: Perfect Vacuum, Pull Apart?

  • Context: High School 
  • Thread starter Thread starter bassplayer142
  • Start date Start date
  • Tags Tags
    Chamber Compressed
Click For Summary

Discussion Overview

The discussion revolves around the concept of a perfect vacuum within a closed chamber and the forces at play when attempting to pull the chamber apart. It explores the implications of external air pressure versus the internal vacuum pressure, touching on theoretical and conceptual aspects of vacuum and pressure dynamics.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions how a perfect vacuum could hold the chamber together when there is no air inside, suggesting it should be impossible to pull it apart.
  • Another participant clarifies that the external air pressure is what holds the chamber together, indicating that the absence of air inside does not negate the force exerted from outside.
  • A participant expresses confusion about how the inside could expand if it is just empty space, indicating a potential misunderstanding of what a vacuum is.
  • Another participant explains that the forces involved are a contest between the outside pressure and any internal pressure, which can be influenced by pulling on the chamber halves.
  • One participant emphasizes that a vacuum does not exert a pulling force, as it is merely empty space, which may clarify misconceptions about the nature of vacuums.

Areas of Agreement / Disagreement

Participants express differing levels of understanding regarding the nature of vacuums and the forces at play, indicating that there is no consensus on the conceptualization of vacuum dynamics and its implications for the chamber scenario.

Contextual Notes

There are unresolved questions about the nature of vacuum and pressure, as well as the assumptions regarding the forces acting on the chamber. The discussion does not clarify the definitions or implications of a perfect vacuum in this context.

bassplayer142
Messages
431
Reaction score
0
Just thinking here. What would happen if you had two pieces of something that connect perfectly and form a chamber of air inside. Then you took all the air out to make a perfect vacuum. Now if you were to pull the sides would it break apart. I don't understand how there would be a perfect vacuum inside that would hold the unit from seperating. If there is no air then it should be impossible to pull it apart right?
 
Physics news on Phys.org
Not impossible. What holds them together is the air pressure outside of them pushing them together.
 
russ_watters said:
Not impossible. What holds them together is the air pressure outside of them pushing them together.

I still don't understand how the inside of it could possibly expand. There is nothing to expand? Maybe I don't fully understand what a vacuum really is.
 
Expansion doesn't matter here.

When there is a closed chamber then there will be an inside pressure and an outside pressure.

The outside pressure will apply force to hold the chamber together.
The inside pressure will apply force to take the chamber apart.

Wether the chamber will come apart or stay together becomes a contest between the outside and inside pressure.

The inside pressure can be helped by pulling on the chamberhalves.

Once Fpull + Finside > Foutside the chamber will break.

http://www.ap.stmarys.ca/demos/content/fluids/magdeburg_hemispheres/magdeburg_hemispheres.html
 
Last edited by a moderator:
bassplayer142 said:
I still don't understand how the inside of it could possibly expand. There is nothing to expand? Maybe I don't fully understand what a vacuum really is.
Since a vacuum is just empty space, it doesn't matter what size it is.

Again, what most people get wrong about a vacuum is that they think it somehow pulls on things. Since it is just empty space, how can it be pulling on anything?
 
Thanks you guys.
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 4 ·
Replies
4
Views
10K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 30 ·
2
Replies
30
Views
4K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 45 ·
2
Replies
45
Views
6K
  • · Replies 12 ·
Replies
12
Views
4K
  • · Replies 114 ·
4
Replies
114
Views
33K