Can a vent be placed underwater?

[capt.phoenix]

The idea being to force the gas to "bubble up" through the liquid. For instance; you might want to have cold hydrogen bubble through a hot liquid to cool it. Or you might want to force chlorine through infected water to help kill germs. I haven't seen builds using it so I assume it will just say the vent is blocked.
Perhaps the high pressure vent?

[koimeiji]

With my experiences using fluid and gases, I don't think it'd work all that well even if the gas could be released in the fluid (not sure if it can, i'll have to test)

Probably better off with using a spaghetti network of pipes in the fluid for heating/cooling large bodies if you're going the non-tuner route.

[Setokaiva]

I'm not sure, but you might be able to use airflow tiles. Airflow tiles let gas through, but block liquids. A cistern lined with airflow tiles could let gas build up 'inside' them, so it would press against the water from below and around the sides. Clever usage of airlocks may allow you to drain out hydrogen gas from the top of the tiles as needed, or you can just leave chlorine in the tiles, in the hopes that it would kill the germs in the water (though I'm not sure if it would actually do anything or not, as gas might not be able to 'touch' the water through the tiles).

But yeah, like Koimeiji [東方] said, a better idea (if you want to do heating/cooling and not cleaning) is just to run non-insulated pipes through water or hydrogen gas. Hot liquid from a steam geyser will cool down lickety-split if immersed in the cloud of hydrogen from a heat biome or what's produced by your Electrolyzers.

[Nostril]

A gas vent placed (or more accurately, submerged, as vents can actually release gas if only partially covered in liquid) in liquid won't emit any gas.

[Grek]

according to my experience - no. sadly.
it will be interesting to do jacuzzi-like stuff

[GD]

To be exact, if the vents tile contains equal or more than 2 kg (fluid) it stops due to overpressure. The new high pressure vent might stop at 40 kg (if I've seen and tested correctly). But 2 or 40 kg are nothing against a hole tile of 1000 kg not to speak of a deeper pool of fluid.

[New Fish]

even a few grams of water blocking a 1x1 hole will stop an unlimited amount of air pressure

[capt.phoenix]

Thank you. I suspected as much. I'm just trying to come up with uses for that annoying chlorine.

[GD]

It's the only gas that liquifies at high temperatures (-30°C or so) (okay CO2 is not that far away as well) every other gas is far below -150°C and more difficult to create and maintain. It's even above the minimum temperature of Wheezeworts. I once considered a water cooling chamber with Chlorine cooled by Wheezeworts far above and dropping into water far below. It would instantly evaporates and presses the warmer chlorine above the water higher to the wheezworts. Well in theory. I forgot, that Wheezworts don't cool below a gases condensation point, so I had to revise it and tried something with a hydrogen layer and doors as seperator. In the end is was not reliable enough and there are others problems involved. Idea behind it was by condensation the heat exchange/transport would be very intense in the chamber, but did not worked out so well.