[Leaning Right]

...and those are hardly the only variables.

My calculations are (as I'm guessing you know) derived from the Ideal Gas Law. And pumping a football with air sure ain't an "ideal" situation!

I do think my calculation has some merit as a guideline. However, it wouldn't (and shouldn't) be accepted as hard proof. The only way to be sure here, from a legal standpoint, is to repeat the entire process under the same conditions as existed on that day.

[lepton]

I do think my calculation has some merit as a guideline.

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As do I. Merely noting that it that is a starting point with many additional potential variables.

To amuse yourself, assume a rigid ball at 1 atmosphere instantaneously raised to +13 PSI, and calculate how much the temperature change could be. That’s a lot of energy.