MaaZeus wrote...
Spartas Husky wrote...
MaaZeus wrote...
Spartas Husky wrote...
MaaZeus wrote...
Cranyx wrote...
^ actually that's a common misconception. If they were in a vacuum(which I don't think they ever were) then yes, the few floating air particles would be freezing, but there would be so few of them that you would actually not freeze. A human can survive in a vacuum without permanent harm as long as they have air supply, your ear don't burst and your eyes don't pop.
There's a NASA article about it here: imagine.gsfc.nasa.gov/docs/ask_astro/answers/970603.html
You can survive, for few minutes that is. Human body can resist vacuum for short time, but it will give in eventually and your body starts to swell and cause a lot of pain. This has been tested too, not in space but in controlled enviroments.
And you are correct, in vacuum heat transfer is incredibly poor, even if space is absolute zero cold you wont feel it for some time. Unless you hit gas cloud or other particles that are as cold as the space around it, they can transfer the heat immidietly and may snap freeze you.
And you are wrong, there are atleast two places where in ME2 you are in complete vacuum and cold space. Derelict reaper after you blow its Mass Effect field and Geth station (geth do not require air nor heat, waste of resources) where you complete a whole mission.
no idea what the page is saying but in the 70's test were made in many depressurized chambers and in space confirming you last ess than 3 minutes before dying. ima find it but the **** of it might not be that you would die but the simple pressure laws ensured, from high to low. And while the sci fi of you exploding is a lie, it is true your body losses what air it has knocking you out within seconds of exposure. This was also confirmed in Russian accidents aboard their space flights so I have no idea where you guys are getting that we are superman and can resist a couple of minutes in vaccum.
Without even counting the aforementioned the mere radiation and exposure to cosmic particles would destroy your organic ability to maintain cell integrity.
But just fmro the top of my astronomy class. When there is no atmospheric pressure water does not hold its form. Water is a tricky substance and is in basic physics and chemistry that atmospheric pressure gives water is liquid form, thus if pressure from a planet or otherwise is not present water expands nearly instantaneous which means turns into gas and boils. Any part of your body exposed to vaccum that holds or is covered in water will blow or melt; aka your tongue will be destroyed in severe injury and your eyes will melt. This is also reported in Russian accident when the Astranout had a suit rupture and all he felt was his tongue being burned out of him ecause of the saliva quickly expanding.
By tests as well your tissue will swell, and although you will not explode like some weird sci fi movie it will kill you after a minute or two
In the end you dont survive in space, period. The pressure problem quickly plays a trick on your system knocing you out within seconds, and the cosmic rays as well as a lack of heat transfer will make sure you boil from the inside out within the next 60 to 120 seconds. So no humans cannot survive in vacuum, without some sort of shields against cosmic rays and the changing state of matter within your body.
Test in chambers and accidents in space have not been lethal but have been close and they just had suit malfunctions.
In space things either boil or freeze there is no space in between. If your far away from a heat producing body you will freeze after w/e surface water boils, if your too close to a heat source you will boil since there is nothing to carry heat away from you. If we could survive in vaccum by just having air supply for at least 60 seconds I would have think astronauts who went to the moon would have at least peed on the moon for the hell of it... or placed their bare foot on moon ground, or touched it with their bare hands.
That is what I meant with few minutes. You will black out due to complete lack of oxygen in some seconds and if you try to hold your breath, it will rupture your lungs. In few minutes your body starts to swell, your blood and other liquids starts to boil and severe damage starts to happen. You might still survive this if you get dragged into safety in time like that astronaut, but vacuum exposure will definetly kill you and fast.
nah dude sry should nto have quoted u. Was talking to cranyx because he said en quote:
"A human can survive in a vacuum without permanent harm as long as they
have air supply, your ear don't burst and your eyes don't pop."
which is not accurate
russian astronauts with just a minor suit failure had medium burns on their tongues and only had so because they spend less than a few seconds with a rupture. Complete exposure would be even worse.
No harm done.
About your body melting, I'm not really sure if that happens. Liquid when it is in vacuum boils, but it is not hot. It is still same temperature as it was but due to lack of pressure its boiling point lowers and therefore it vaporates, becomes steam. Opposite situation is also possible and used. In normal air pressure (1 bar give or take IIRC) water starts to boil in 100 celsius. But in higher pressure the boiling point gets higher. This is effectively used in modern car engine cooling where the cooling liquid is pressurised so it wont boil even if it reaches 100C. Thats why you are not allowed to open the cooling liquid container of your car when it is hot because the released pressure will splash the hot water all around burning you.
About the russian astronaut (kosmonaut) I dont remember anything about tongue burning, just saliva boiling. It still shouldnt be hot due to above mentioned reasons, unless my physics class failed me completely.
No no, not hot as in "temperature".... although the astranaout did reported that it felt as "burning". Absence of water within tissue creates discrepancies in body temperate that although no heat is involved does create burns.
Now the body does not melt because the water is underneath the tissue, the only water that "boils" although boil would be somewhat incorrect, the better word would be it evaporates with or without heat, simply because the lack of pressure of any kind allows the water to expand thus becoming gas. The process while not necessarily requiring heat does register in the body as such.
Saliva will evaporate and the quick of doing so does make the particles move at incredible speeds to turn into gas and in doing so do create some heat.
The eyes is the same, neither our eyes nor tongue are made to resist much heat... unless is my freacking parents which they can drink damn coffee lava for all they care... but they are freaks so exception must be made.
Nevertheless any water within the tissue is under pressure, thus it does not evaporate but it still conserves heat since there is no "atmosphere" to draw heat from you. When there is no atmosphere and your accumulating vast amount of heat too fast... well that is just nasty way to die. Now.... how exactly does a body react when far enough of a star, or heat producing body, I dont know; are cosmic rays enough to induce heat to be captured or do you just become a rock of sorts?... not really sure on that one.
Like I said, there is no middle ground in space when it comes to water... it either boils or freezes, only factor that changes things are pressure; whether it comes from magnetism of a planet's core or simply because the water was trapped under alot of mass from the start.
Modifié par Spartas Husky, 08 janvier 2011 - 05:46 .
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