How much does compressed air weigh?

[Lohman446]

Anyone with quick access to like a 45/45 tank empty, a scale, and then same full of air could tell me this. Or anyone who happens to know, how much does the air in the tank weigh?

[zackzel]

Anyone with quick access to like a 45/45 tank empty, a scale, and then same full of air could tell me this. Or anyone who happens to know, how much does the air in the tank weigh?

I don't know the answer to this but why do you ask?

[Lohman446]

I don't know the answer to this but why do you ask?

Curiousity, arguing with people on PBN

[punkncat]

Curiousity, arguing with people on PBN

That was your first mistake.


I know there is a way to figure this given weight of air at sea level, multiplied by the pressure, etc., etc.,....but it would be negligable and unable to be weighed on a scale I imagine.

[electriceel125]

That was your first mistake.


I know there is a way to figure this given weight of air at sea level, multiplied by the pressure, etc., etc.,....but it would be negligable and unable to be weighed on a scale I imagine.

Im pretty sure its a weighable difference.

[punkncat]

Im pretty sure its a weighable difference.

Is that the same argument going on PBN?

/just curious

[MANN]

let me finish my pizza, and ill go weigh. is it ok that I do 3000 instead of 4500? and it should be the same weight.

[Zneaky]

here is a simple proof.

I always take my Scuba tank to the scuba shop to be filled for PB.

They put the tank in water, because when you are moving that much compressed air, it gets hot.

When they first put the tank in, it floats. As they are filling it, it sinks to the bottom (3 ft).

Now an alluminim sucba tank is only filled to 3000psi, 3500 if you know someone. Your 45/45 is filled with more molecules of air per square inch so it would be heavier per square inch than my scuba tank.

Z

[buzzboy]

We do the experiment in shcool with a balloon. The amount of weight difference between a filled and unfilled balloon is noticible on an electronic gram scale. Saddly I can't remember how much it weighs.

[snoopay700]

here is a simple proof.

I always take my Scuba tank to the scuba shop to be filled for PB.

They put the tank in water, because when you are moving that much compressed air, it gets hot.

When they first put the tank in, it floats. As they are filling it, it sinks to the bottom (3 ft).

Now an alluminim sucba tank is only filled to 3000psi, 3500 if you know someone. Your 45/45 is filled with more molecules of air per square inch so it would be heavier per square inch than my scuba tank.

Z

Beat me to it, air is made of molecules, compressed molecules are still molecules. Molecules have mass, therefore it weighs more filled, much like a football.

[MANN]

my scale for my CO2 says they weigh the same.

[punkncat]

I'm sold. I would like to know how much more my 68/45 weighs full.....

[MANN]

I'm sold. I would like to know how much more my 68/45 weighs full.....

not enough to make a difference

[Tao]

Curiousity, arguing with people on PBN

LOL are they saying COMPRESSED air is wieghtless???

Well so far I have found in my chemestry book:

pressure = mass x acceleration -where acceperation is gravity (9.8)

so double the mass double the pressure or vice versa.

You will need to find what the mass of air is at standard pressure (find out how many mols of each gas there are per cubic inch) and find out how many pounds/square inch standard atmosphre pressure is.

It will be easier to work in kilograms (on earth 1kg= 2.2456lbs) since kilograms measure mass not wieght (and you can baffle all those on BPN )

[neppo1345]

According to my calculations:

Filling a 68 Cubic Inch tank to 4,500 PSI at sea level will increase it's weight by .4183 kg = .921 Lbs


However that doesn't seem right, meaning I most likely did something wrong.

Joe, where you at?