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In the video there is a small amount of gas, I had 10 litres of Co2 in my fermenter, so cold crashing in some days, not in one minute, I think my headspace is not full of 02 in few seconds as you said. The only one who did not respect other people opinions was you, because you did not just put...

Thanks! I think I'll start with a balloon and watch what happen

And I add, I think it would be difficult to not hear 1.5 litres trough a 30 cc airlock

I've got 10 litres of headspace, that were full of Co2, before this stupid cold crashing

Well I've followed all the fermentation, and I could clearly hear the bubbles of the Co2. As you say that the space is rapidly filled, so while I chill the fermenter I should hear or see this clear bubbling. This make me think that the only reason I don't hear or see any bubble is because the...

Okay thanks I've seen the video now. But what about a plastic bucket?

But when you ask to describe "oxidation", except for the heavily oxidated, thay can't! They give this name to anything is wrong with the beer as literally said by someone in this post. Excluding all the factors that come in brewing. That's incredible

Of course I will use the measures for the next cold crashes, thanks to the people who responded and gave me advice. I am very sorry for those who shoot sentences convinced that they have the truth in hand and have no intention of confronting each other

This sentence has been repeated a lot of time, and referring to something that is not incorrect at all. As someone said I pick up several litres of O2 but can not answer to the question "why not a single bubble in the airlock". So because it is a forum, maybe someone can read it and hear...

So, for you, "you are completely wrong" it's a normal explanation in a constructive conversation. Then okay

I can not hear people say "you completely wrong" or things like that, to other people, as they have the truth in their hand, when their is nothing more approximate than our hobby. Maybe to justify thousands of dollars' worth of equipment, and then repeat the same sentence without giving a real...

They can run at the light speed for me, the video show how slow two different weight gas mix, when someone said it happens in a fraction of a second, and it's wrong. Can you explain me why there is not a single bubble in the airlock, when you say are coming in at least 10 litres of air? Without...

But I've not open my bucket [emoji848]

Yes, and someone here said that O2 and Co2 mix IMMEDIATELY because the particles go 138377 km/h, when we have a bucket FULL of Co2 and an amount of O2 that comes in of what, some mL?

It says exactly that if a gas it's heavier than another it takes a lot of time to mix

I think that's a bit exaggerated and simplistic, and of course not "the best way to discribe oxidation" but.. Okay

But when the Co2 get out there is a continuous bubbling, why would not be the same for 02?

So can we say that as long as I do not suck water, oxygen will not enter? Yes I've cold crashed it

The liquid in the airlock is the same from the beginning of the fermentation, so i've not sucked it into the beer, I think. However I don't know if it's sure that 02 get into the bucket when pressure drop. I think the airlock would bubble, as when the Co2 get out

Excuse me, I'm not good in English. My carboy doesn't let air in anywhere, so it is air tight in this sense. I just don't know if it can be pressurized with the C02, I think not being a simple bucket.