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What is The Lowest Pressure That a Human Body Can Withstand?

 
DUCM900
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12/28/2012 09:27 AM

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What is The Lowest Pressure That a Human Body Can Withstand?
Am I a dumb? Cant find any infos, So YOU tell me please, Tnx.

science


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Last Edited by IWASTHERE on 12/28/2012 09:28 AM
To live is to believe in the power of dreams.
To dream is to believe in the power of love.
To love is to believe in yourself.

Luca 21:28 "Ma quando queste cose cominceranno ad accadere, guardate in alto e alzate i vostri sguardi, perché la vostra liberazione è vicina".
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12/28/2012 09:35 AM
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Re: What is The Lowest Pressure That a Human Body Can Withstand?
Well air pressure is about 14 lbs per sq inch.


The human body is balanced against this.


Dont have the number, but we could crunch some. At what point would our internal pressure (about 14 lbs per sq inch) be too much for our skin to take vs the air pressure.


Hmm, going to have to do some digging.
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Anonymous Coward
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12/28/2012 10:38 AM
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Re: What is The Lowest Pressure That a Human Body Can Withstand?
What you can't do when the pressure gets too low is breathe. Don't try to climb Everest without supplied air. Your diaphragm can't do the job by itself as breathing also depends on diffusion/osmosis, which won't work if there isn't enough pressure pushing air into your lungs, aveoli, then on out into the blood. (I don't remember the exact mechanics as it has been a long time since I was in school - - which explains why I put it as diffusion/osmosis instead of just one or the other.)

As for low pressure effects on the body: Astronauts/Cosmonauts visit outside the atmosphere and seem to do fine. It's the lack of gravity that starts to damage them.
Anonymous Coward
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12/28/2012 10:39 AM
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Re: What is The Lowest Pressure That a Human Body Can Withstand?
OOOPS! "aveoli" was supposed to be "alveoli"
av8r
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12/28/2012 10:47 AM
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Re: What is The Lowest Pressure That a Human Body Can Withstand?
check flight physiology...I heard that blood boils at 50k feet
DUCM900 (OP)

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01/03/2013 10:45 AM

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Re: What is The Lowest Pressure That a Human Body Can Withstand?
bump1
To live is to believe in the power of dreams.
To dream is to believe in the power of love.
To love is to believe in yourself.

Luca 21:28 "Ma quando queste cose cominceranno ad accadere, guardate in alto e alzate i vostri sguardi, perché la vostra liberazione è vicina".
Mez353
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01/03/2013 10:51 AM
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Re: What is The Lowest Pressure That a Human Body Can Withstand?
We can withstand a vacuum for a short while. Known as it has happened by accident in labs etc.

[link to imagine.gsfc.nasa.gov]
Anonymous Coward
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01/03/2013 11:01 AM
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Re: What is The Lowest Pressure That a Human Body Can Withstand?
It's all about Oxygen. Pressure is required to keep the oxygen transporting from your lungs into your blood. The FAA requires pilots to use O2 above 10,000 ft. which is about 10 psi. To maintain consciousness above that altitude you need additional O2. So to answer your question technically, it's only 10 psi. If you HAD pressurized O2 forced into you (as with the old USAF high-altitude masks) you might make it to 40k feet for a while ... which is 2.7 psi.

On a side note, the astronauts in the early US space program used like 95% O2 at 3 psi. Until it blew up Apollo 1.

[link to www.engineeringtoolbox.com]

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