You can tell him that air does have weight and that it is approximately 14.7 pounds per square inch at sea level. That's why when we descend to 33 feet in salt water, we are down the equivalent of 2 atmospheres, the one of air and another with the equivalent pressure in water.
Liquid in your tank
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to go and try to make liquid air....that would be really cool...let me know how that turns out
R
redacted
Guest
'Cause only Buba kows thingslike that. Can he also tell you how wind chill makes ice even at 40 degrees?
A bathroom scale would demonstrate the truth if you don't mind wasting a tank.
Send you sister a sympathy card.
A bathroom scale would demonstrate the truth if you don't mind wasting a tank.
Send you sister a sympathy card.
I don't really think this is the right place to ask, but it goes along with the topic. What are the possibilities of blending nitrox by putting liquid oxygen in the tank and then topping it off with air?
It wouldn't be feasible or accurate, but I just want to know if it would work out ok.
brandon
It wouldn't be feasible or accurate, but I just want to know if it would work out ok.
brandon
scuba-punk
Contributor
give me a couple days to look through my thermo book from school. i know that it has some phase charts for nitrogen (maybe air). my guess is that i'm not going to find charts for n2 as a liquid for temperatures above 200 kelvin (73 below 0 celsius). i'll come up with something. i promise. actually, now i'm curious to see how many cubit feet of air you would have to (or could) cram into an al80... 
ut:
ut:
detroit diver
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I can think of a couple of concerns right off.
1. How does the cold temp of the liquid oxygen effect the structure of the container (ie tank)?
2. What would it do to the valve O-rings at that temp?
Interesting question, though...
There were some previous discussions on the potential of breathing a liquid compound instead of a gaseous mixture. Kind of sci-fi, but it really intrigued me.
I have had inlaws like that and have learned to ignore them over the years.
DennisW
Contributor
As you've heard, air does have weight. In fact the airlines have to account for the weight of air in their Weight and Balance calculations. Us little guys that don't fly very high and don't pressurize our planes don't bother because it's too little to matter. If your Brother In Law would think about it, he would realize that his statement was not logical since at sea level on the surface of the earth, the column of air that sits on his head weighs 14.7 pounds per square inch.
Theoretically yes, it could be done, but it would take a very small amount of liquid O2 b/c it is much more dense as a liqiud than it is as a gas at room temp. Also, I wouldn't want to be around while that tank was warming up the liquid O2...think of the catastorphic possibilities there. Also, I would like to see the aluminum cylinder that can withstand having liquid O2 introduced to it.
Don't liquid O2 containers have vents? As the gas warms the presure is kept low. Some high volume gas blenders buy liquid O2. Because of the low presure a booster is needed to pump it into scuba tanks at the required presure.
It wouldn't seem to make sense to hvae liquid gas in a scuba tank due to the low presure and low temp. I guess the relief valve could poerate at a higher presure but I see that being a little risky.
It wouldn't seem to make sense to hvae liquid gas in a scuba tank due to the low presure and low temp. I guess the relief valve could poerate at a higher presure but I see that being a little risky.
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