5 will be the only one that will ever fill up unless you really crank up the pressure in which case 7 will also fill but very slowly. 5 and 7 are open containers and there's a hole in the bottom of 4. But if it's water coming out of a tap then only 5 will fill .

[–] CileTheSane@lemmy.ca 17 points 1 day ago (2 children)

The connection between 2 and 3 is blocked.

[–] hungryphrog@lemmy.blahaj.zone 4 points 1 day ago

Damn, I didn't even notice that.

[–] pingveno@lemmy.world 3 points 1 day ago

Even if you assume that it is not blocked, it is still 5. The pipe from 2 to 3 is never reached because 4 leaks out the hole in the bottom. Assume that the hole in the bottom is a flaw and 4 still leaks out the top before the pipe to 3 is reached.

[–] toddestan@lemm.ee 4 points 1 day ago (1 children)

1 can also fill up if the flow from the faucet is higher than what can exit through the pipe connecting to 2.

[–] Seasm0ke@lemmy.world 1 points 1 day ago

There it is!!! That connector is too narrow, only way it isnt 1 is if the pressure is criminally low.