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How does an open bottom fish tank work? Answered


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lemonieBest Answer (author)2010-01-04
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Re-design (author)lemonie2010-01-04

Your link even details making a vacuum pump.

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lemonie (author)Re-design2010-01-04

I spent a bit of time looking, you tend to come across the same video clip a lot...

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CherylTX (author)2012-06-07

But what about the air being pumped into the upper tank? Wouldn't that allow the water to drop as the air replaces the water?

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Re-design (author)2010-01-04

Set up your tank.  THe bottom is open and the top is closed.  Put a tube up to the top of the tower and suck out the air with a shop vac. and water will fill the tower and stay there.

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AndyGadget (author)2010-01-04

My first thought was "not very well" but then I went and found out what an open bottomed fish-tank is.
It works by the air pressure on the surface of the lower open tank preventing the water running out of the raised tank.  Atmospheric pressure will support a column of water up to around 32 feet.   As Steve says, try it on a small scale with a glass.

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steveastrouk (author)2010-01-04

Just with atmospheric pressure. Try it in your bathroom sink. Fill the sink, fill  a glass with water, invert it under the water and then lift the glass ALMOST out of the water.

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