awesome tank from youtube, claims to be the first "open bottom tank"

  • We are currently upgrading MFK. thanks! -neo
That might be the first model of open bottom tank, but there's now way it is THE first.

DMasker;4321043; said:
Its pretty simple physics. As long as water cannot enter the water column the water will stay in the upside down tank above the water line of the lower tank. The fish are free to swim around the lower section and swim up the water column in the upside down portion. If air starts to enter the water column somehow water will be displaced and as much air enters, that much water will enter the lower portion. You can also make a stronger current as long as the rippled never allow air to enter the water column. Pretty interesting idea. Hopefully I explained that well!
Click to expand...
That isn't exactly correct...The reason the water stays in place is because the vacuum keeps it from coming out as long as air isn't let into the top tank, in which case the amount of air that enters is equivalent to the amount of water that will exit the tank, which is why a pump is needed to ensure that the water will not all exit the upper tank at once and cause a flood.

An easy way to understand this concept is to take a cup of water (or any drink, really) and put a straw into it, then completely cover the dry end with your finger and lift the straw out of the water. If you are covering one end completely, then the water (or whatever liquid you used) will stay in the straw "defying" gravity.
 
drgnfrc13;4321514; said:
That might be the first model of open bottom tank, but there's now way it is THE first.


That isn't exactly correct...The reason the water stays in place is because the vacuum keeps it from coming out as long as air isn't let into the top tank, in which case the amount of air that enters is equivalent to the amount of water that will exit the tank, which is why a pump is needed to ensure that the water will not all exit the upper tank at once and cause a flood.

An easy way to understand this concept is to take a cup of water (or any drink, really) and put a straw into it, then completely cover the dry end with your finger and lift the straw out of the water. If you are covering one end completely, then the water (or whatever liquid you used) will stay in the straw "defying" gravity.
Click to expand...

Another way is to just fill your sink with water. Fully submerge the cup, then have the open end down and slowly pull above the water line. But, do not pull above the waterline.
 
"That isn't exactly correct...The reason the water stays in place is because the vacuum keeps it from coming out as long as air isn't let into the top tank"

That isn't exactly correct...:p

There is no vacuum... by admission the tank is full of water and/or air.

Pressure is the key factor.
 
I saw these on youtube a while ago. There was one where an air pump was running and putting air into the tank on the top. Don't get how that one worked :screwy:
 
Going too long without a wc and allowing for some evaporation to happen would be a disaster with this! Sweet setup and idea!
 
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