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/sci/ - Science & Math

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File: 87 KB, 503x755, district_nine.jpg [View same] [iqdb] [saucenao] [google]
3346579 No.3346579 [Reply] [Original]

Out of curiosity: how scientifically accurate is District 9?

>> No.3346587 [DELETED] 

you realize that was a documentary right?!

>> No.3346590

Not that much. The beggining was cool, then it turned into shit.

>> No.3346596

It isn't.

>> No.3346597

FOCK

>> No.3346603

>>3346587
This movie is allegorical representation of south africas fight against the non human africans

>> No.3346609

Not accurate at all. The movie was, by and large, turds.

Actually, your image boasts the biggest implausibility of all.

>> No.3347056

>>3346603
I found this theme to get increasingly dilute as the movie progressed.

>> No.3347071

Only slightly less accurate than the Spongebob Movie.

>> No.3347082

my favourite movie of all time. made me tear up quite a few times. btw im a guy

>> No.3347566

Almost identical to reality in fact. The only mistake is that aliens actually enjoy dog food, not cat food.

>> No.3347576 [DELETED] 

>>3347056
Of course, it's sci fi movie. The more they mentioned spaceships and things that don't exist IRL, the more it becomes sci fi.

That, however, doesn't take away from the theme of apartheid.

>> No.3347612

>>3346579
I was fascinated by the idea of having something dangerously large and heavy floating above populated city. So I had a glimpse at some fundamental physics and hope that when the experiment goes well comparable technology might become achievable/feasible.

Anyway can you guys please advise me equation describing evaporation of solid material surface as a function of time, temperature and the rest of the variables incorporated as scaling factors? Many thanks unfortunately googling didn't turn out to be very useful. Many thanks.

>> No.3347633

> awesome weaponry
> enslaved by humans

>> No.3347645

>Babies that start popping because someone set their egg on fire
Maybe.
>Attaching a limb to a body in a way that causes the nerves to fuse together seamlessly
Perhaps
>Guns that can recognize certain DNA patterns and refuse to work to those that don't match
I think we already have guns which have sensors on the handle that recognize the owner's finger prints and only work for him only

>> No.3347646

>>3347612
Solids don't evaporate

>> No.3347653

>>3347646
Solids can be turned into liquid, which can be turned into gas, ergo evaporation. Probably a proxy evaporation though.

>> No.3347670

>>3347653
>>3347645
Solids melt, liquid evaporates, end of story.

>> No.3347676

>>3347646
Well I'm interested in the little amount of evaporation. What I need to compute is as the tantalum sheet will evaporate it will deposit thin layer of tantalum on a another carbon sheet (at same temperature btw). And I'm interested on how much will be deposited - while the whole experiment is set up in a very sensitive way therefore deposition of even several microns of tantalum will make a large difference.
That's why I would like to first compute it - I mean I will be incredibly happy if solids/tantalum really didn't evaporate, honestly that will be the best outcome from the experiment but unfortunately I doubt that will be the case.

>> No.3347680

>>3347653
They do sublime
The rate differ between materials

>> No.3347725

>>3347680
Please do you know any relation with time for it? I found only equations with vapor pressure though I am not sure how to incorporate it with time.

>> No.3347769

>>3347646
l2 sublimation.

Seriously, you are supposed to learn it in 6th grade, or whenever you had your first chemistry class.

>> No.3347774

>>3347725
That is because Sublimation is instantaneous

With the right Temperature and Pressure

I guess the only time constraint is the quantity of material undergoing sublimation, then again that would change the rate of sublimation, ie, time is already intrinsic to the rate...

so explosion time?

>> No.3347780

>>3347769
I'm not the one you'r replying but the problem is that I don't actually remember any evaporation equation that incorporates temperature and time. Do you know any? It will be very helpful. Many thanks.

>> No.3347783

>>3347769
Sublimation isn't evaporation. It's a valid distinction and provoking the poster who pointed it out when they understand it already is not appropriate.

>> No.3347792

>>3346590
>>3346603
Sure is "I hated the theme of the movie" in here.

Even though neither of you could accurately name the theme if you tried.

It was an exceptionally good sci-fi movie. One of the best I've seen in YEARS.

>> No.3347793

>>3347774
No no, more like how much matter will be sublimated with time - it's clear the longer it evaporates the more matter is sublimated. I mean we can assume it's linear - for simplicity, how to get the evaporation rate? - assuming it's perfectly un-saturated environment etc.

>> No.3347797

>>3347725
There isn't any bro.

I guess you could make one yourself, but it's basically how strong of a heater you've got (j/s) divided by how much of a mass times specific heating point of the heated solid.

Something like that, I'm talking out of my ass here, somebody must know their basic physics better here.

>> No.3347805

>>3347783
A distinction that he did not point out correctly. He's missing the ", rather some of them sublimate" part, giving the impression of being stupid, arrogant asshole, hence my own tone. My mistake if he was a good soul just trying to help around.

>> No.3347848

>>3347805

Did not get the impression myeslf

rate of sublimination has a time component,

e ^ (- B/kt)

>> No.3347885

>>3347848
What I mean is, if you use the equation for the rate then the answer you get will be Mass/Time, with respect to mass, density, pressure and temperature.

>> No.3347916

The fuck are you guys talking about?

>> No.3347921

>>3347848
Please what are the variables?

>> No.3347950
File: 7 KB, 523x129, df10.jpg [View same] [iqdb] [saucenao] [google]
3347950

>>3347921

>> No.3347966

>>3347950
so the v naught give the time aspect

>> No.3348402

>>3347950
>>3347966
Many thanks. May I ask where is the equation from (so that I can pick up the appropriate values, as an example what the B is? - Many apologies I am not Mech eng. so I don't know this stuff unfortunately. - If you have the source I will be able to just read the whole article. Many thanks again.

>> No.3348475

>>3348402
http://iopscience.iop.org/0004-637X/537/2/796/50404.text.html

equation 10, its about gamma rays vaporizing dust

K is the Boltzmann constant