HHhhaarrr!fisherdvm:The weight of air is dependent on temperature, barometric pressure, humidity, and humility.
Great one!
So very, very true
Rick
how much does air weigh?
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Great one!
So very, very true
Rick
dkktsunami
Contributor
Air in a full 80 weighs appx. 6 pounds. For easy figuring that doesn't require precision, 6 divided by 80 equals .075 lbs./cu. ft.
Despite all the responses that will want you to take into account humidity, phase of the moon, etc., 13 cubic feet per pound will serve you well.
So 80/13 = 6 pounds. So an AL 80's "swing weight" is six pounds.
And yes, I ignore the folks that fall over each other to point out that an AL80 is actually 77.37925822172653 cubic feet. Nice, round numbers work. If you want to know exactly, you have to jump into the water and dive the problem. Calculating it out to 27 decimal places doesn't help.
Roak
So 80/13 = 6 pounds. So an AL 80's "swing weight" is six pounds.
And yes, I ignore the folks that fall over each other to point out that an AL80 is actually 77.37925822172653 cubic feet.
Nice, round numbers work. If you want to know exactly, you have to jump into the water and dive the problem. Calculating it out to 27 decimal places doesn't help.Roak
SteveFass
Contributor
So the air inside a properly filled HP steel tank will weigh 1/4 (or a couple of lbs) more than in a LP steel?
(assuming the two tanks are rated the same cu.ft.)
(assuming the two tanks are rated the same cu.ft.)
TxHockeyGuy
Contributor
SteveFass:
No, if you had a LP95 that holds 95 cubic ft at 2400 psi and a HP95 that holds 95 cubic ft at 3442 psi then the weight of the air, and thus the swing will be the same. The weight of the tanks due to thickness, size, etc probably will not.
SteveFass
Contributor
Oh, yeah. Right. I knew that. I was just testing you.
(is there a way to delete a message you already posted?)
(is there a way to delete a message you already posted?)
OP
H2Andy
Contributor
ok, here's the result of my calculations using the .08 lbs/cf figure
my LP85's (doubles) weigh 86 lbs filled to 3500 psi
if i get LP108s, they'd weigh 106 lbs to the same capacity
if i get LP120s, they'd weigh 112 lbs to the same capacity
trying to think how much my back can handle
(fills to 3500 psi are routine in dive shops geared for tech or cave diving; i am aware of the risks; thanks for not telling me i'm going to die =)
my LP85's (doubles) weigh 86 lbs filled to 3500 psi
if i get LP108s, they'd weigh 106 lbs to the same capacity
if i get LP120s, they'd weigh 112 lbs to the same capacity
trying to think how much my back can handle
(fills to 3500 psi are routine in dive shops geared for tech or cave diving; i am aware of the risks; thanks for not telling me i'm going to die =)
You're gonna DIIIEEEE!!!H2Andy:
Rick
No, you're stuck with it forever, along with the snide commentsSteveFass:
- or -
for a small fee.......
Rick
OP
H2Andy
Contributor
Rick Murchison:You're gonna DIIIEEEE!!!
Rick
only IF i actually use them...
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