/sci/ - Science & Math

Only theoretically possible, maybe even less than that. Superconductors are one of the only reasons for even trying.

can't be achieved?

Laws of thermodynamics say no

>>1280214

It isn't impossible, it's just impossible to maintain absolute zero in an finite amount of steps. It is, in theory, possible to have 0 kelvin for some amount of time.

.............the only way we humans can make things cold is by putting them in or near other cold things or removing the atmosphere (creating an endothermic environment)....

space is about as endothermic as you get and that isnt absolute zero

>>1280245 the only way we humans can make things cold is by putting them in or near other cold things or removing the atmosphere
Laser cooling.

>>1280245
what is the temperature of space?

>>1280267
2.7 degrees kelvin

>>1280267

If we put a thermometer in darkest space, with absolutely nothing around, it would first have to cool off. This might take a very very long time. Once it cooled off, it would read 2.7 Kelvin. This is because of the "3 degree microwave background radiation." No matter where you go, you cannot escape it -- it is always there.

>>1280275
Isn't temperature a property of matter? In the absence of any matter whatsoever, i.e. a perfect vacuum (which you seem to assume), isn't temperature actually undefined?

>>1280267

>>1280271 and >>1280275
Are both wrong. Space has no temperature. Temperature is a measure of vibrations of particles.

>>1280284
>>1280283

This. Space has no temperature by definition, as there's nothing *there* to have a temperature.

The ambient temperature of particles in space is in the single digits kelvin, though, but that's not the same as space having a temperature.

>>1280321

So if you stand two feet from the suns atmosphere, there will be zero kelvin?

>>1280361
Be precise. What do you mean by "there"?

>>1280381

They claim that since there is no matter in space, by definition there can't be a temperature. Since no location in vacuum is special, everywhere where there is vacuum there should be the same temperature, even right outside the sun. By their logic you could place your self in the nearest point near the sun where there is absolute vacuum and observe 0 kelvin.

>>1280321
>implying space is a perfect vacuum

>>1280409
>They claim that since there is no matter in space, by definition there can't be a temperature.
No. There can be matter in space, but space is not composed of matter.

>Since no location in vacuum is special, everywhere where there is vacuum there should be the same temperature, even right outside the sun.
The space around the Sun is not empty, you ignorant. A star is constantly emitting radiation.

>By their logic you could place your self in the nearest point near the sun where there is absolute vacuum and observe 0 kelvin.
No.

>>1280409
As soon as you place yourself (or a different measuring instrument) at that location, it ceases being a vacuum.

>>1280409
>>1280409
>implying absolute vacuums exist

>>1280450
>implying it was a vacuum in the first place

>>1280423
Nowhere in his post is he implying that. Stop trying to be edgy.

>>1280453
Red herring.

>>1280467
That's the point. Stop being dense.

>>1280492
>implying space is a vacuum

>>1280467
No, just carrying on the assumption. Yes, the assumption may be wrong, but that's kind of the point of an assumption.

>>1280068
INTERSTELLAR SPACE IS NOT A PERFECT VACUUM FAGGOTS

>>1280499
>implying you weren't assuming that

>>1280504
>i'mokaywiththis.jpg

>>1280068
>>1280080
No, it is impossible.

In order to reach 0 kelvin you need to literally stop time everywhere in all existence. There can be no background "radiation" which is the reason no one will ever actually reach 0 kelvin. This is because all matter will have vibration. Without that vibration, it will no longer be matter, and thus will become energy(background radiation).

This is fucking /x/ shit. Get it out of my /sci/.

>>1280562

Go back to your fucking math theoretical bullshit. In all practical purposes 1 picokelvin is so near absolute zero, only a mathematician would deny it.

>>1280584
>/sci/ - Science & Math
>& Math

>>1280275
Faraday cage.

Where's Hawking now?

>>1280601
In his wheelchair?

>>1280584
>In all practical purposes 1 picokelvin is so near absolute zero, only a mathematician would deny it.

Still not 0 kelvin. Take your denial somewhere else.

You can't reach 0 kelvin. Never. Shit, the simple act of trying to measure something that is suspected to be 0 kelvin will warm it up even if it's the measurement device itself.

>>1280663
Similar to this. I believe there was a time and temperature uncertainty theorem/formula for this.

http://www.youtube.com/watch?v=y2jSv8PDDwA

>>1280678
Cooling is a thermodynamic process.
Thermodynamics:
>You can't win
>You can't break even
>You can't get out of the game
>As a system approaches absolute zero, all processes cease and the entropy of the system approaches a minimum value.
>As a system approaches absolute zero, all processes cease
Wasn't that easy?

>>1280704
>You can't win
>You can't break even
>And you can't leave the game.
>Cause entropy will take it all, though it seems a shame.

>>1280728
>>1280704
>You can't get out of the game.
>And you can't leave the game.
>the game
:B