How much oxygen is there...

semi-pro waster said:
I'm not sure that experiments have ever been done on humans to test this though, there are certainly some that have been tested on other mammals such as mice and they can breathe in liquids for a time but will usually die of pulmonary or respiratory problems relatively shortly afterwards (assuming they survive the initial dunking). So at the moment it looks unlikely you could utilise liquid breathing, at least for diving, but who knows what future advances may bring.
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It's to do with the lungs ability to flush enough liquid through the system and at the same time transport the required gases across the lung surface.
Liquid is too viscous to breathe without effort. With effort you produce too much C02 for the liquid to exchange
 
Aah, the Yellow Box of Death!

I really like the idea of rebreathers, but the cost at the moment is really prohibitive :(
 
Scubascorpion said:
Made up. The human body doesn't have the ability to respirate a liquid
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semi-pro waster said:
I'm not sure that experiments have ever been done on humans to test this though, there are certainly some that have been tested on other mammals such as mice and they can breathe in liquids for a time but will usually die of pulmonary or respiratory problems relatively shortly afterwards (assuming they survive the initial dunking). So at the moment it looks unlikely you could utilise liquid breathing, at least for diving, but who knows what future advances may bring.
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Scubascorpion said:
It's to do with the lungs ability to flush enough liquid through the system and at the same time transport the required gases across the lung surface.
Liquid is too viscous to breathe without effort. With effort you produce too much C02 for the liquid to exchange
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It is possible and has been tested on humans without ill effect, but most of the work has been done on mice. Its a liquid polymer substance designed with a high affiniety for gaseous exchange, it does work and the latest models do indeed use forced liquid exchange (i.e. a machine pumps the liquid in and out of the lungs to keep liquid circulaiton moving.), you are right though the latest challenges iv read about is the removal of CO2, they have got the 02 content and exchange of the liquid spot on, but designing a liquid to have a good ability to 'loose' oxygen and 'gain' C02 well is tricky. Latest ideas basically involve a total life support suit that uses liquid polymer as the breathing liquid, with forced liquid exchange and litterally a closed system directly into your blood stream to filter out CO2 :eek:
 
YBOD Yup, our name for them too.

It's not just the cost of the equipment though, the preparation and rigorous attention to detail on those things is just too much for the time spent underwater.
 
Energize said:
Just compressed air? That seems incredibly inefficient, the nitrogen could be reused continuously and CO2 removed providing a much larger capacity.
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In terms of money though tank of air is much more efficient than a complicated/expensive re breather :p
 
Anyway....

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2 cylinders at 16grams each = 2x8 litres.


For easy working we can average 4 litres per breath at sea level. So 4 breaths or 2 breaths at 10 meters down.

that's assuming they were using the co2 bulbs from homebrew :D

2iqiz9f.jpg
 
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Scubascorpion said:
Made up. The human body doesn't have the ability to respirate a liquid
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It is actually a solid theory, the liquid used is a Perfluorochemical, unfortunately I know far too little about it to explain it in any real way and in fact I don't understand most of it, however it's something that is being developed for mainly medical use.

Look up Liquid breathing if you want details.
 
Fenris said:
It is actually a solid theory, the liquid used is a Perfluorochemical, unfortunately I know far too little about it to explain it in any real way and in fact I don't understand most of it, however it's something that is being developed for mainly medical use.

Look up Liquid breathing if you want details.
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Scubascorpion said:
I don't need to look it up, I explained the problems with it in post 21
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ummm...



Combat squirrel said:
It is possible and has been tested on humans without ill effect, but most of the work has been done on mice. Its a liquid polymer substance designed with a high affiniety for gaseous exchange, it does work and the latest models do indeed use forced liquid exchange (i.e. a machine pumps the liquid in and out of the lungs to keep liquid circulaiton moving.), you are right though the latest challenges iv read about is the removal of CO2, they have got the 02 content and exchange of the liquid spot on, but designing a liquid to have a good ability to 'loose' oxygen and 'gain' C02 well is tricky. Latest ideas basically involve a total life support suit that uses liquid polymer as the breathing liquid, with forced liquid exchange and litterally a closed system directly into your blood stream to filter out CO2 :eek:
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But the fact still stands that you cannot breathe the liquid.
They are having to force it in and then recover it which is having it's own issues.
 
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