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Underwater Explosions - Smarter Every Day

ReverendTed says...

>> ^messenger:

My best guess: water would shoot out the top and bottom, and soon after, the sides of the bottle would be sucked in from the momentum of the water leaving and nothing replacing it.>> ^grahamslam:
So what would happen if he exploded it without the cap on it?

Exactly like we see in their "self portrait" burst. The top flies off and the sides of the bottle collapse inward.

Underwater Explosions - Smarter Every Day

ReverendTed says...

My initial suspicion was the same as the host's - that the bottle was rocketing up and the cap was "overrun" by the rest of the bottle. That doesn't hold up to scrutiny since the cap "shrinks" back rather than staying still.

In their first explosion, the cap actually explodes very quickly after the burst. That seems relevant. I'm not sure how.

My second thought is along the "vacuum\low pressure" line of thinking. The entire bottle is pressurized in the instant of the explosion, and then ruptures at the bottom, so now the bottom of the bottle is lower pressure as water is rushing out, pulling the cap end down. Bernoulli principle, perhaps?
I imagine a bottle full of water, but it has no bottom. The water is rapidly and forcibly evacuated. The logical thing is for the cap to be crumpled downward.

Ooh, wait. Could this have something to do with the gas at the top of the bottle vs the liquid? I'm having flashbacks to the Mythbusters episode about the sinking car, and how the pressure of the water inside the car was lower than the outside as long as significant amount of air was left in the vehicle, so even though the water was up past the inside of the car door, it still couldn't be pushed open until the rest of the car had equalized. This seems relevant to me as well, though I'm not sure how, exactly.

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ReverendTed says...

Oppa, as I understand it, is like "big brother" in the vein of a trusted older brother, perhaps one who is responsible for the care of his younger daughter. Might be likened to a sugar daddy, but with a less negative connotation.

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ReverendTed says...

Oh, dang. It looks like I missed a great opportunity to dialogue with hpqp about choices and personal responsibility again!

Anyway: Obesity is a disease. It is not "normal". It's a dangerous condition with proven health risks to the individual and demonstrable costs to society.
Obesity is multifactorial. Behavior, metabolic or genetic disorders, societal pressures, and the list goes on...
Regardless of the totality of the condition, behavioral factors are almost always involved, and by their nature are always controllable given adequate motivation. (They're behaviors, after all.) This doesn't mean they're enough by themselves in all cases, but they're a necessary component.
Non-behavioral factors are often controllable with medical intervention. The decision to seek medical intervention is often a controllable behavior. ("Barriers to access" acknowledged.)



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