[darklitch]

i've searched google but no luck without knowing exactly what the device is called which bubbles a gas through a liquid then traps the gas at the end. If there is no name then what exactly could i use to allow a gas to enter a container at the bottom but with no liquid entering the gas chamber below?
thanks,
jack

[Borek]

Please elaborate, I don't understand what the problem is.

As far as I know such a setup doesn't have a special name. Google "collecting gas over water" or something similar.

[AWK]

?
http://en.wikipedia.org/wiki/Water_pipe_percolator

[Donaldson Tan]

Sounds like a beaker/cylinder suspended upside down inside a huge trough of water.