On the "dirty oxygen" problem

[seriousfoul]

Will the official or the players,

the details of the "dirty oxygen" and "oxygen" weight and temperature difference, etc.?

Many people have this problem, they want to know "dirty oxygen" and "oxygen" is the same or not

[GreatGameDota]

"Dirty" oxygen's official name is polluted oxygen. Both types are exactly the same except germs can spread through polluted oxygen.

[Foefaller]

3 hours ago, seriousfoul said:

Will the official or the players,

the details of the "dirty oxygen" and "oxygen" weight and temperature difference, etc.?

Many people have this problem, they want to know "dirty oxygen" and "oxygen" is the same or not

if by "dirty" you mean "polluted" then the answer is... technically no.

Polluted Oxygen is created when Polluted Dirt or slime dissolves when exposed to any gas, of Polluted Water when exposed to Oxygen or Polluted Oxygen. Polluted Oxygen I believe is slightly heavier than regular Oxygen, as (for me at least) it tends to be at ground level when the two mix, though I can't give you exact mass. it also has a slightly higher Specific Heat Capacity; 1.01 instead of 1.005

Both are perfectly breathable by dupes. However, Polluted Oxygen is the only substance other than slime that Slimelung can multiply in, and since Polluted Oxygen from Slime will carry any Slimelung that was on the slime, deodorizers are important for breaching into Slime Biomes.

[The Plum Gate]

4 minutes ago, Foefaller said:

Polluted Oxygen I believe is slightly heavier than regular Oxygen,

This used to be the case - now it bands out according to it's shared density properties with O2. Strangely, a single light weight/mass bubble of PO2 will float to the top of an area of O2 of higher pressure, while a pocket of heavy PO2 will sink in area O2 having less weight/density. This makes it difficult to process large rooms of PO2 with generic air filters without the use of a pump. Thus, it can be assumed the O2 and PO2 share the same base density in a distillation column and only differ in their thermodynamic properties and not necessarily their "material density".

Makes things tricky to sort out O2 and PO2 unless you have known weight values to work with. It will go up or down in O2 - ? - all depends on how dense the PO2 is relative to the density of O2 it is being introduced to. Or visa versa.

I've got a few pockets of high PO2 floating on a pocket of O2 in part of my base because of this.

[Kasuha]

1 hour ago, Foefaller said:

Polluted Oxygen I believe is slightly heavier than regular Oxygen

I haven't ever noticed any difference. Single packets of polluted oxygen in pure oxygen perform typical random walk to me while usually sticking to the same height and only occasionally going up or down. When the polluted oxygen amount is higher, their packets tend to clump together and make "clouds" or "bands" that can stay at about the same place forever and are even hard to get rid of with a pump.

The most reliable approach to get rid of polluted oxygen mixed with clean oxygen is to displace both gases with some other gas (hydrogen, NG, chlorine, CO2) and then remove that while filling the space with clean oxygen. It's also possible to seal the room and make vacuum in it but that may take very long time.