If you had a large compartment of water say a few thousand litres inside a spacestation and the outer hull ruptured exposing it to space what would happen. Would it freeze or just float out
Cymek said:
If you had a large compartment of water say a few thousand litres inside a spacestation and the outer hull ruptured exposing it to space what would happen. Would it freeze or just float out
That’s not really a lot of water. Only a volume of 2 cubic metres.
Cymek said:
If you had a large compartment of water say a few thousand litres inside a spacestation and the outer hull ruptured exposing it to space what would happen. Would it freeze or just float out
How big is the rupture?
Michael V said:
Cymek said:
If you had a large compartment of water say a few thousand litres inside a spacestation and the outer hull ruptured exposing it to space what would happen. Would it freeze or just float out
How big is the rupture?
1 meter or so in diameter
It’s in a movie I am wawatchi
Watching
Sorry using phone and battery is running low
Cymek said:
Michael V said:
Cymek said:
If you had a large compartment of water say a few thousand litres inside a spacestation and the outer hull ruptured exposing it to space what would happen. Would it freeze or just float out
How big is the rupture?
1 meter or so in diameter
It’s in a movie I am wawatchi
Ah. Movies. Much misunderstanding.
Cymek said:
Michael V said:
Cymek said:
If you had a large compartment of water say a few thousand litres inside a spacestation and the outer hull ruptured exposing it to space what would happen. Would it freeze or just float out
How big is the rupture?
1 meter or so in diameter
It’s in a movie I am wawatchi
Ah. Movies. Much misunderstanding.
There are compartments of water at the lunar poles that have been exposed to space for millions of years…
Bottom line: it can’t stay liquid. Most of it will vaporise but small ice crystals will also form, and if they are exposes to the sunlight, they’ll also become gas.
Cymek said:
If you had a large compartment of water say a few thousand litres inside a spacestation and the outer hull ruptured exposing it to space what would happen. Would it freeze or just float out
The standard explanation is boil then freeze. But that doesn’t immediately tell me if it would freeze as a solid block of ice or as a myriad of tiny crystals that float out through the rupture. It would be interesting to perform the experiment, full scale, in a vacuum chamber.
It would boil all-at-once, and the best analogy I can think of is the sudden boiling of superheated water.
Looking again at this Mythbusters slo-mo video of the boiling of superheated water https://m.youtube.com/watch?v=1_OXM4mr_i0 I can see that it explodes into a shower of mm size droplets. The surface tension of the water would stop the droplets from getting much finer than that.
Each of these droplets would freeze and the resulting cloud would float out of the rupture.
At a guess.
In the movie ‘Apollo 13’, one of the astronauts does a ‘urine dump’.
The contents of urine bags are vented to the outside of the spacecraft, and the droplets instantly freeze into shining ice particles as they’re pumped out, with the astronaut describing it as ‘the constellation Urion’.
This was a genuine phenomenon, and is described in Jim Lovell’s book about Apollo 13, ‘Lost Moon’. It was something most astronauts found quite pretty.
mollwollfumble said:
Each of these droplets would freeze and the resulting cloud would float out of the rupture.
At a guess.
Assuming the droplets were at about 300 K, why wouldn’t they vaporise before they froze?
captain_spalding said:
In the movie ‘Apollo 13’, one of the astronauts does a ‘urine dump’.The contents of urine bags are vented to the outside of the spacecraft, and the droplets instantly freeze into shining ice particles as they’re pumped out, with the astronaut describing it as ‘the constellation Urion’.
This was a genuine phenomenon, and is described in Jim Lovell’s book about Apollo 13, ‘Lost Moon’. It was something most astronauts found quite pretty.
So mollwoll was right?
Do we have an explanation for this phenomenon?
The Rev Dodgson said:
captain_spalding said:
In the movie ‘Apollo 13’, one of the astronauts does a ‘urine dump’.The contents of urine bags are vented to the outside of the spacecraft, and the droplets instantly freeze into shining ice particles as they’re pumped out, with the astronaut describing it as ‘the constellation Urion’.
This was a genuine phenomenon, and is described in Jim Lovell’s book about Apollo 13, ‘Lost Moon’. It was something most astronauts found quite pretty.
So mollwoll was right?
Do we have an explanation for this phenomenon?
sometimes people are correct
Arts said:
The Rev Dodgson said:
captain_spalding said:
In the movie ‘Apollo 13’, one of the astronauts does a ‘urine dump’.The contents of urine bags are vented to the outside of the spacecraft, and the droplets instantly freeze into shining ice particles as they’re pumped out, with the astronaut describing it as ‘the constellation Urion’.
This was a genuine phenomenon, and is described in Jim Lovell’s book about Apollo 13, ‘Lost Moon’. It was something most astronauts found quite pretty.
So mollwoll was right?
Do we have an explanation for this phenomenon?
sometimes people are correct
I was being deliberately ambiguous, but I meant the phenomenon of water freezing in a vacuum before evaporating really.
The Rev Dodgson said:
Space is bloody cold. Aboard Apollo 13, they had terrible troubles with keeping warm.
Apollo craft would adopt what was called ‘the barbecue roll’ going to and from the Moon. The spacecraft would be put into a slow longitudinal roll, like a rifle bullet, so as to evenly expose its surface to the hot sun-side, and then to the staggeringly cold shade-side.
The explosion aboard 13 upset this, and they couldn’t restore the roll. It seems that ‘cold’ won, and it got so cold that moisture (from astronauts’ breath, etc.) froze on all surfaces in the spacecraft. They were constantly very cold, and dreamed of the splashdown in the warm Pacific tropics.
When the heat of re-entry unfroze all that moisture, it ‘rained’ inside the capsule.
If vented to the shady side, the urine would have frozen, and there’d be enough reflected form the spacecraft, the Earth, and the Moon light to make it shine.
The Rev Dodgson said:
mollwollfumble said:Each of these droplets would freeze and the resulting cloud would float out of the rupture.
At a guess.
Assuming the droplets were at about 300 K, why wouldn’t they vaporise before they froze?
Think of it first from the more familhar perspective of superheating. Some water vapourises and some remains liquid. The timescale, though very short is still long enough for the vapour to coalesce through surface tension into bubbles and the liquid to coalesce through surface tension into droplets.
The heat transfer by convection and diffusion decouples on sub-mm scales from the mass transfer (small scales because of short timescale) and this allows the latent heat from vapourisation to cool the small droplets to freezing point.
Urine sparkles freezing in space was noted on Gemini 7 from 1965, if not earlier.