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> If you exhale a sufficient amount of air you can actually sit comfortably on the bottom of the pool without floating upwards.
this is not a universal truth.. depends on your body composition. If i exhale all my weight I will still have quite a few KG of positive boyancy.
> It's not a joke. I don't refer to drowning. It's just that the oxygen is in the blood, etc., not in extraneous reservoirs, making me heavy enough to sink.
It is because you dont have a giant bubble sitting in your lungs making you float yea.
> I think my trick uses the same basis as what the video explained.
We may be thinking of different videos then. In the video I watched the people who held their breath had a lung full of air, they didnt exhale. The guy did sit ont he bottom of the water despite having a lung full of air, but that is likely because he was either fairly muscular or had weights on.
@freemo really, positive boyancy from the mass? Hmmm .. I guess given material density. That makes me wonder if I could still pull it off. 😋
@cobratbq Yes I just checked.. As of my last dive if I exhale all my breath in salt water, I would need about 5kg in extra weight to be neutrally boyant. 6kg to sink effectively.
In fresh water, the number is likely closer to 3 - 4KG needed to sink without air in my lugs
@freemo oh wow. I have no expertise in this area, but it is interesting. It had never occurred to me.
Its actually simple to understand... Fat floats, pour oil on water or put a stick of butter in water and see...
Muscle sinks and is denser than water.
The fatter you are the harder it is to sink... I am fat, I do not sink.
@freemo material density, right? I know it well enough. I just hadn't considered it for this case because it came easy when I used to do it.
@cobratbq Yup in the end its all about density... thats why as a scuba diver when im neutral if i breath in I go up, I exhale I go down.. I dive caves and often control my breath to control my movement.
@freemo oh that sounds like a nice way for finely-tuned control. I wonder if it is as natural as it sounds from the description.
@cobratbq Not natural at all.. new divers take quite a few dives before they get their boyancy control in check... For me as an expiernced diver at the top of the expertise scale, yes its very natural for me and i can do back flips and blow bubble rings, and go through very narrow openings with sharp edges comfortably... but it took many years and many hundreds of dives to get to that point.
Even now when i dont dive for a year I need to spend a little time in a pool or shallow water on my first dive just remembering my skills.. They come back quickly, but they really do take some practice.
@cobratbq I want to add something that might help you understand the expiernce...
First is the fact that there is a noticable delay between your breath and your boyancy change. This is just momentum, the force due to boyancy is light so takes a while for you to move or to reverse momentum.
Second, your body wants to control both your rate and volume of breathing based on your CO2... forcably trying to change your breathing for reasons of boyancy means you sometimes have to hold your breath when you want to take a breath and vice versa... The longer you do this the more the effects build up and can feel a bit like suffocating if you are particularly bad at your timing.
Now when you combine those two you constantly are wanting to do one thing, needing to do another, and any reaction (like avoiding something you are about to hit into) needs to be planned several seconds ahead....
Combine all that and, well, its a lot to coordinate and still have it feel natural... Eventually you become very aware and its all so easy, you just think ahead automatically and react... but you need to spend a lot of time int he water doing it before it is automatic.
@freemo I got it. Great description. 🤓