How does an open bottom fish tank work?

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lemonie7 years ago
Read this perhaps?

la-main (author)  lemonie7 years ago
Your link even details making a vacuum pump.
I spent a bit of time looking, you tend to come across the same video clip a lot...

CherylTX5 years ago
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?
Re-design7 years ago
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.
AndyGadget7 years ago
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.
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.