wow fascinating. There is more physics here than just a simple boom. Look at the way the bubble oscillates just after the bottle ruptures. At the time the plastic bottle explodes the internal pressure of the CO2 gas is much higher than that of the surrounding water pressure and the inertia of the gas as it escapes "overshoots" the diameter at which the internal pressure of the gas bubble would be at local equilibrium with the water pressure. The water pushes back in on the bubble and because the gas volume is compressible (and water is not) it collapses; AHH but it "overshoots" the equilibrium point again this time in the opposite direction! Now the gas pressure in the bubble is higher than the surrounding water pressure again so it expands and it goes on like this expanding and contracting. But the bubbles are bouyant! So they are rising as this osclillation (which is being damped out by internal friction of course) is occurring and as they rise the external water pressure the bubbles "feel" is less and less so the oscillation frequency goes up as they rise. Also if you look closely you can see that it is only the pressure waves from this oscillation that cause the surface of the water to "spall" and the actual gas does not reach the surface until the very end. So you hear three distinct noises, first the initial shockwave of bottle rupture, then oscillating water spall at the surface caused by pressure waves from the bubble oscillation and THEN the bubbles of gas breaking at the surface sloshing the water around.

Trained professionals? At least they used gloves but no tripods.

Thanks, gluonium.

Yeah, I was wondering, too. Thanks!

Anyone want to explain the title though? What does this have to do with homeschoolers?

Neat video btw

Comment hidden because you are ignoring dag.(show it anyway)

It's a bit of an in-joke GJ, quite a few Sift regulars are homeschoolers, and some videos have been posted for experiments to try as lessons.

I wish people doing cool things like this would put more effort into making the video watchable. Tripods ftw.

the steadily increasing frequency of oscillating splashes sounds wicked.

this reminds me of when i had the idea to use a 4 foot pole with a hollow end to hold otherwise boyant 'silver-salutes' and 'm80' firecrackers underwater as a kid. good times.

Freakin awesome. It sounds like it set off a car alarm at the end of the first explosion!

*water

Adding video to channels (Water) - requested by EDD.

*fire

Adding video to channels (Fire) - requested by geo321.