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/sci/ - Science & Math

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File: 53 KB, 513x784, mission_to_mars[1].jpg [View same] [iqdb] [saucenao] [google]
2063978 No.2063978 [Reply] [Original]

So, I am reading through all the mistakes in this movie, and I notice that no one mentions how he just freezes to an icicle in two seconds as soon as he's exposed to space.

lolwut? This is ridicilously incorrect, isn't it? No one would just freeze to death, I mean, it's a nothing, isn't it? Damn my high school knowledge.

>> No.2063987

Regardless of any mistakes, I enjoyed this movie thoroughly. No I am not a Scientologist or Raelian blah blah blah.

>> No.2063986

yes
your are geniose

>> No.2063993

Exposure to vacuum will not result in freezing. In fact, they would stay warm indefinitely so long as they are alive because the only way to lose heat in vacuum is via radiation, which is very slow. No atmosphere = no convection or conduction to lose heat.

However, the reduction in pressure means much lower boiling points. So, water on yuor skin will boil away, and cary away some heat with it. Not HUGE amounts, but your skin will feel cool and your eyes will dry out very quickly.

Exposure to vacuum will kill you in about 90 seconds, but you will lose consciousness after about 10-15.

>> No.2063994

>>2063987
Me too.

It's about Mars and space travel, so I knew I'd like it.

>> No.2063998

>>2063993
How will it kill you? You mean breathing?

>> No.2064004

>>2063998
yeah, exhale all the air you can from your lungs and see how long you can hold your breath. Exposure to vacuum will expel basically all of your air, making you go unconscious quickly and likely damaging your lungs.

>> No.2064005

>>2063998
Depressurization. Your body can't cope with it for long, hence rapid loss of consciousness. You die from that + no oxygen.

AFAIK if you're connected to a pressurized oxygen supply and take long, slow breaths, you could survive nearly indefinitely save for evil space radiation giving you cancer. I'm not 100% on that, because I haven't seen any information regarding whether exposure to depressurized environments will kill you by itself.

>> No.2064009
File: 18 KB, 800x634, FINALLYINSPACE.png [View same] [iqdb] [saucenao] [google]
2064009

>>2063993
>>2064005
damn, i was just about to post this

WHY DO ASTRONAUTS EVEN WEAR SPACESUITS IF ALL THEY NEED IS A HELMET FOR BREATHING AND KEEPING THE EYES PROTECTED?

PIC RELATED IT'S A COMMON SIGHT ORBITING AROUND MARS, YEAR 2150

>> No.2064010

>>2063994
I just wikied and imdb'd the movie. Apparently it wasn't very well received (oh what a surprise, sci fi that wasn't very well received), what were some reasons? I only remember enjoying the movie D:

I'm >>2063987 by the way.

>> No.2064014

http://www.geoffreylandis.com/vacuum.html

Interesting read.

>> No.2064015

>>2064005
How then will it actually kill you in 90 seconds?

>> No.2064019

>>2064009
>>2064009
because your body is not able to circulate blood. Read >>2064014
And I'm pretty sure your body swelling to twice it's normal size doesn't feel too great.

>> No.2064021

>>2064014
Interesting, thanks.

>> No.2064034

What does a breathing supply matter if you can't get the blood around and your body swells to twice its size?

>> No.2064041
File: 732 KB, 1784x1460, h2o_phase_diagram_-_color.v2.jpg [View same] [iqdb] [saucenao] [google]
2064041

>>2063993
Your statement is 90% correct, however you neglect the fact that in a vacuum as well as boiling point increasing there is a decrease in freezing point.

Check the phase diagram. At zero atmospheres of pressure water can only be a liquid or solid. Any water molecules at the surface of your body which do not have the energy to become gas will become ice immediately.

Tl; Dr.
Your skin freezes in space.

>> No.2064047

>>2064041
It becomes solid. Doesn't mean it becomes cold.

>> No.2064053

>>2064041
but it would boil away first... not leaving anything to freeze....

>> No.2064062

let's pretend a human is 100 kg of liquid water with an emissivity of 1 and a surface area of 2 metres squared, at a starting temperature of 300 kelvin. stefan-boltzmann law tells us that this thing radiates heat at about 900 watts (900 J per second.) but it takes about 420,000 J to change its temperature by 1 degree.

so yes, the movie was wrong. good catch.

>> No.2064063
File: 23 KB, 285x425, the-core-movie-poster-1.jpg [View same] [iqdb] [saucenao] [google]
2064063

If you want to find scientific mistakes in a movie, you should watch this OP.

>> No.2064068

>>2064063
Freaking love that movie too.

Scientific mistakes don't ruin my cheesy adventure CGI fun!

dem diamonds

"How many languages do you speak?"

>> No.2064071

>>2064053
That's not how heat transfer works.
If it were we wouldn't have ice comets.

When you take the temperature of a liquid you are taking the average of billions of molecules. At the molecular level temperature is distributed randomly; so not all the molecules will have the energy to become a gas.

>> No.2064074

>>2064041
http://www.geoffreylandis.com/vacuum.html

Comprehensive overview of exposure to vacuum based on empirical research.

>> No.2064077
File: 63 KB, 433x559, 1255293002991.jpg [View same] [iqdb] [saucenao] [google]
2064077

>>2064071
Huh. You learn something new everyday.

>> No.2064084

>>2064071
I don't know. Unless you back this up with something, I'm going with the NASA-guy.

>> No.2064087

>>2064071

>At the molecular level temperature is distributed randomly
Temperature is a macroscopic quantity. It makes no sense to discuss it "at the molecular level"

>> No.2064088

>>2064034
>>2064034
>>2064034

>> No.2064094
File: 398 KB, 300x263, Translational_motion.gif [View same] [iqdb] [saucenao] [google]
2064094

>>2064084
I need to back up that heat is the random motion of particles? I thought this was basic knowledge.

http://en.wikipedia.org/wiki/Kinetic_theory
>>inb4 wikipedia not a good source.

>> No.2064096

>>2064094
>I need to back up that heat is the random motion of particles?
Derp.

>> No.2064105,1 [INTERNAL] 

>>2064105
I think the derp part is him obviously knowing what the first guy is talking about, the theory overall, but deciding to answer bullshit because derp ie "Derp."

You're just an idiot, on the other hand.

>> No.2064105

>>2064096
>>2064094
yeah tell me about it. super derp.

hey engineer stop doing science, it'll hurt your head

>> No.2064112

>>2064105
I think the derp part is him obviously knowing what the first guy is talking about, the theory overall (as that's what "NASA-guy" is about), but deciding to answer bullshit things because derp ie "Derp."

You're just an idiot, on the other hand.