Impossible Fish Tank - Oita Marine Center

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Take a glass and put it in the bath tub. Let all the air out and then point the mouth down. Pull the glass out of the water. Thats how its done. The higher point is completly sealed and no air goes in. If you get a leak air will actually go in and water will come out of the feeding ports just like if you were to poke a hole in the bottom of your glass, the water would flow back into the bath tub and the top of the glass would fill with air. Simple Physics.

Jeff
 
gasser;1124594; said:
Take a glass and put it in the bath tub. Let all the air out and then point the mouth down. Pull the glass out of the water. Thats how its done. The higher point is completly sealed and no air goes in. If you get a leak air will actually go in and water will come out of the feeding ports just like if you were to poke a hole in the bottom of your glass, the water would flow back into the bath tub and the top of the glass would fill with air. Simple Physics.

Jeff
Click to expand...
that rather irrelevant. try putting holes in the side of your glass and see if the water stays in there ;)
 
I've now read what seems to be 3 explanations, but none really seem to make sense. Vacuums, and glass tipping, and bathtubs oh my.

Ok, the straw thing. I understand if you stick your finger on the end it will form a vacuum but where is the "finger" in this tank?

If you take a glass and put it in the bath tub and form a vacuum, that would make sense too, but the ports are open, not sealed like the glass sticking out of the water.

So, no understand. Que?
 
here is why it works, a straw is a little different because of how narrow they are. with something bigger like a pvc pipe for instance, you have to have a J bend it it so that gravity is still holding the water level, and the vacuum keeps it from over flowing. it gets more complicated because of the multiple feeding ports. they all have to be the same elevation or gravity will make the water level try to equalize and air will flow in the higher one and water out the lower.


vacummtank.bmp


but then there is the issue of water changes and the initial filling of the tank, not to mention cleaning. I think like some of the others have suspected, that there is a hole probably sizable enough for a diver to fit through (judging from the size and shape of the tank) that remains sealed. but they also probably have sealing caps for the feeding ports as well, so they don't lose water when the vacuum is broken. at least thats how i would go about doing it.
 
i've been trying to draw something out, but i suck at drawing.
it seems like everyone here is thinking that it's basically a completely sealed tank other than for those holes for feeding.
i think the fish would suffocate if that were the case.
 
ok here's my shot at explaining it. refer to the picture and the markings i drew on there.

krt061.jpg


The red dots point out open-top water. That's why there is a grate there. Simple enough.
The blue arrows are panels that run down below the water line, but of course the bodies of water are still connected to eachother.
The green line is the water level. The feeding holes would simply be a ledge if they were moved horizontally right over to the open-top, indicated by the red dot.

If you imagine the feeding tubes being extended on the outside straight up, such as in captainawesome's awesome sketch, the water would obviously not go any higher or lower than the green water line.
 
yeah, aeration is the only issue i can't seem to work out, your guaranteed to get a build up of air in the top, and that would cause an overflow in the feeding ports. possibly a capsule at the top that is higher than the rest of the tank, where the air builds up, and when the water level reaches the bottom of the capsule, it has a sensor that starts up a vacuum at the top to get rid of the excess air. it would have to be one hell of a strong vacuum for it, but I think that would work. either that, or the vacuum is always running pulling air through the feeding ports, solves the aeration problem and you don't need a bubbler:headbang2 they probably have it all worked out as part of their filtration system though.
 
ThePBM;1125018; said:
i've been trying to draw something out, but i suck at drawing.
it seems like everyone here is thinking that it's basically a completely sealed tank other than for those holes for feeding.
i think the fish would suffocate if that were the case.
Click to expand...


I was with the vacuum ideas but suffocating would be a problem if no air flowed in tank ?

I am more confused now :nilly:

Maybe they have water moving threw pipes that gets filtered and air.
Would all have to be SUPER sealed to allow no air or water in or out.

I see water on ground too....but looks like might be right out front of store so could have rained that day.Didn't see water running out of feeding holes.

Somebody do an experiment,PLEASE.
(post lots of pics of course)

I too would love to know how.
 
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