Does it feel like someone covered your face with a pillow, or similar to being underwater, etc.
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Assuming you could survive.
When you breathe in the diaphragm contracts allowing the rib cage to expand, this creates a ‘vacuum’ in the body which is immediately filled with air from outside. This movement of air relies on the difference in pressures between the outside air and the newly created vacuum inside your lungs. If there is no air pressure from outside then there would simply be no movement of anything. So it probably wouldn’t feel like anything, you’d just be expanding your chest and relaxing it again.
Idk.
It feels like dying.
Because that is literally what will happen to you pretty f’ king quickly if you “try to take a deep breath” in the near vacuum and freezing temperature of space
Not only is there no oxygen, there’s also no air. This may seem like a pedantic difference but it really isn’t. If you breathe pure nitrogen gas (which is what air mostly is), you will feel completely normal until you pass out and die of asphyxiation. In space, there’s no nitrogen gas. There’s no air pressure at all. The internal pressure in your body would face no resistance and would most likely cause your lungs to collapse, though I’m not aware of any scientific studies to that effect.
In all likelihood, trying to breathe in space would feel like your lungs collapsing.
You can’t take a breath in space.
The air in your lungs will flow out whether you like it or not. The whole system is not designed to fight against a one atmosphere under pressure.
Supposedly your beast chance is to let the air escape and not fight it by trying to hold your breath or breath in. Once all the air is out you are somewhat safe-ish and can try to breath, but it won’t work.
There heaven been a whole lot of people who have tried to breath in vacuum so what that would feel like is not clear.
This is not something you can really test ethically and accidents in vacuum chambers and similar are thankfully rare.
Presumably it would feel a bit like trying to breath very thin air only much more so. Not much like drowning or being suffocated.
One would assume that it is in any case only a very brief sensation and overshadowed by panic and the sensation of everything else that goes wrong.
Our bodies are evolved to have instincts to deal wit drowning and being suffocated. Those instincts don’t work as well for things like inert gasses and presumably would also lead you astray when exposed to vacuum.
the opposite actually. because space is a vacuum, all the gas and liquid stored in your blood and body is going to expand and boil trying to escape, causing you to swell like a balloon since your body wants to literally pop itself. thats of course ignoring the extreme temperatures in space as well, so you’re also turning into a block of ice or being scorched. assuming you are even still capable of even inhaling, your lungs would expand like normal but you wouldn’t feel anything rushing into them.
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