Or inflate two balloons to the same size, and use one as a control.
Perhaps more than just two. Calculating the rest would be...difficult.
On Sep 22, 2015 9:18 PM, "Chris Prata via KRnet" <krnet at list.krnet.org>
wrote:

> Keep it simple. As long as you factor in the permeability of balloon
> latex. You'd have to subtract the permeability losses over time to
> calculate the scope of a leak. I dont have the permeability of latex to air
> molecules (if you arent using another gas with larger molecules), but you
> should also consider the effects of the latex formulation, thickness,
> ambient temperature, humidity, and of course pressure.  Once you have those
> calculated, you should be able to determine the volumetric losses at the
> balloon, and then you can know the losses (if any) at the tank being tested.
>
> HTH
>
>
>
> > Date: Tue, 22 Sep 2015 13:56:12 -0500
> > To: krnet at list.krnet.org
> > Subject: Re: KR> Fuel tank pressure test
> > From: krnet at list.krnet.org
> > CC: ppaulvsk at aol.com
> >
> > If you noticed in my picture you saw a thread wrapped around the balloon
> and if thread  falls off that means the balloon has qshrunk which means you
> have an air leak. Why make it difficult?  Keep it simple
> >
> >
>
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