That would require a tremendous amount of helium. A little over 507 ft3 for a thirty-five pound horn, by my estimate. The most you could compress that to, reasonably, in laboratory settings, would be about 355 ft3. But to be honest, I'm not entirely sure what the interior volume of any tuba might be, even if they were all a standard volume, which they aren't. You would best be served by tying balloons to the tuba, and that would take about 1300 for a thirty-five pound horn, using the standard size (11") balloon.bloke wrote:Since the 20 lbs. of static force could - very easily, indeed - overcome the strength of the arc of a tuba bell...hopelessly crushing the bell, shouldn't anyone who rests a tuba on its bell be filling up said tuba with helium, prior to attempting this risky stunt?
You know, I think I need something to do with my life.