[PSUBS-MAILIST] formula

[hank pronk via Personal_Submersibles]

Alan,Internal volume atmospheric pressure.Hank 

    On Friday, March 3, 2017 3:24 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hank, firstly in the US they refer to scuba tanks by their filled volume ie.a 80 cu ft tank has 80 cu ft of air when filled. Whereas the rest of theWorld tends to refer to the internal volume of the tank in litres ie. a 10 litre dive tank. By 10.7 cubic feet are you referring to internal volume or filled capacity?Alan

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On 4/03/2017, at 10:30 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


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 halvethe amount of air & weight. In other words, if you double the pressure youdouble the weight for a given volume.Let us know what you are trying to calculate if this doesn't help.Alan


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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 youHank

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<Weight of gas.pdf>

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