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Author Topic: Would an empty bag be easy to open in a vacuum?  (Read 2452 times)

Charles Smith

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Would an empty bag be easy to open in a vacuum?
« on: 22/02/2010 12:30:03 »
Charles Smith asked the Naked Scientists:
   
Great Show!

If you were to have a bag that had all the air sucked out of it and you took it into space or subjected it to a vacuum, would it be easy to pull apart?

What do you think?
« Last Edit: 22/02/2010 12:30:03 by _system »


 

Offline flr

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Would an empty bag be easy to open in a vacuum?
« Reply #1 on: 22/02/2010 13:42:45 »
i guess no.
 

Offline graham.d

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Would an empty bag be easy to open in a vacuum?
« Reply #2 on: 22/02/2010 14:01:04 »
I think you're idea is right that it would be easier to pull apart. The big gloves of your space suit may hamper your dexterity a bit though:-)
 

Offline chris

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Would an empty bag be easy to open in a vacuum?
« Reply #3 on: 23/02/2010 08:44:47 »
I would argue yes, because what makes a closed, empty bag hard to open in an atmosphere is the weight of the air pressing the sides of the bag together (at the rate of 10 tonnes per square metre).

In a vacuum (or even a lower pressure environment) there would be no / less air hitting the outsides of the bag to press the sides together and hence it would open more easily (assuming no electrostatic attractions or other adhesive effects...).

Chris
 

Offline Geezer

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Would an empty bag be easy to open in a vacuum?
« Reply #4 on: 23/02/2010 09:44:17 »
Actually, I don't think it makes any difference. As soon as you break the seal (assuming the bag has a seal) the internal and external pressures (or absence thereof) equalize.
 

Offline doppler1

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Would an empty bag be easy to open in a vacuum?
« Reply #5 on: 23/02/2010 12:56:53 »
Is this with or without the space suit helmet on??? :)
 

Offline doppler1

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Would an empty bag be easy to open in a vacuum?
« Reply #6 on: 23/02/2010 13:07:22 »
I agree that the only thing that could be affected would be the initial breaking of the seal before the air equalizes the pressures. That would also depend on the type of seal etc
 

Offline chris

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Would an empty bag be easy to open in a vacuum?
« Reply #7 on: 23/02/2010 13:45:28 »
That was what I was getting at, with those squashed-flat, impossible to peel apart, bags-on-a-roll things...
 

Offline doppler1

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Would an empty bag be easy to open in a vacuum?
« Reply #8 on: 24/02/2010 20:20:07 »
The blooming impossible to open bags would be equally difficult to open in space but probably much more frustrating than they are worth so I think we should leave those behind on the next trip. If we pressurize them before we leave then they will actually open themselves............just gotta work on how to get the timing of opening right now.
 

The Naked Scientists Forum

Would an empty bag be easy to open in a vacuum?
« Reply #8 on: 24/02/2010 20:20:07 »

 

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