[PSUBS-MAILIST] formula

[Cliff Redus via Personal_Submersibles]

84.8 lbs assuming a 60F ambient temperature.  See attached derivation.

Cliff

On Fri, Mar 3, 2017 at 2:52 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan,
> I need to know how much  a 10.7 cubic foot tank will extra when pumped up
> to 1,500 psi.  And how many cubic feet of air will I have when it is pumped
> up.
> Hank
>
>
> On Friday, March 3, 2017 12:28 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
>
> Hank,
> air weighs .0807 lbs per cubic foot approximately, depending on
> temperature.
> So if you have an 80 cubic foot scuba tank the air weight full is 6.45 lb.
> A scuba tank is 80 cubic ft at 3000 psi. If you halve the pressure you
> halve
> the amount of air & weight. In other words, if you double the pressure you
> double the weight for a given volume.
> Let us know what you are trying to calculate if this doesn't help.
> Alan
>
>
>
> Sent from my iPad
>
> On 4/03/2017, at 6:33 AM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Okay, I am stumped!  can someone give me a formula to calculate the weight
> of air at a particular psi per cubic foot.
> Thank you
> Hank
>
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