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Old 12-21-2014, 10:29 PM   #21 (permalink)
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First zero-gravity 3-D printer manufactures wrench in outer space in less than a week | Daily Mail Online

Well that's a pretty good idea.
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Old 01-11-2015, 01:01 AM   #23 (permalink)
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Not that new, but still...
Oh, and can someone explain this? I consider myself relatively well versed for a layman when it comes to science, but I don't get how it worked at all.

Quantum gas goes below absolute zero
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Old 01-11-2015, 07:21 AM   #24 (permalink)
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Originally Posted by grindy View Post
Not that new, but still...
Oh, and can someone explain this? I consider myself relatively well versed for a layman when it comes to science, but I don't get how it worked at all.

Quantum gas goes below absolute zero
Absolute zero is the temperature at which every substance known to man becomes frozen. And when I say frozen, I mean to the point where the particles that comprise the substance no longer have any motion. So if they've found something that can go below absolute zero without being completely suspended, then that's pretty exciting news!
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Old 01-11-2015, 07:35 AM   #25 (permalink)
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Absolute zero is the temperature at which every substance known to man becomes frozen. And when I say frozen, I mean to the point where the particles that comprise the substance no longer have any motion. So if they've found something that can go below absolute zero without being completely suspended, then that's pretty exciting news!
That I do understand.
I study mechanical engineering, and we have lots of thermodynamics, physics and even dabbled in quantum physics a little, for good measure.
But I absolutely don't understand how they achieved it and how a temperature can be below absolute zero. Obviously the exact science behind it is way too complicated, but I thought someone might get all this talk about the reversal of the amount of higher to lower energy particles and all that.
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Old 01-11-2015, 07:51 AM   #26 (permalink)
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Old 01-11-2015, 08:17 AM   #27 (permalink)
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That I do understand.
I study mechanical engineering, and we have lots of thermodynamics, physics and even dabbled in quantum physics a little, for good measure.
But I absolutely don't understand how they achieved it and how a temperature can be below absolute zero. Obviously the exact science behind it is way too complicated, but I thought someone might get all this talk about the reversal of the amount of higher to lower energy particles and all that.
Well, temperature is just a way of gauging movement in particles (which creates friction, and summarily heat). So absolute zero was the lowest temperature thought possible, as everything ceased to move. But if there are particles than can keep moving beyond it, then the scale of temperature will expand to accommodate it.

Think about it like this: Imagine there's a field of grass that expands infinitely into the horizon. On the field, people run as far as they can, and then when they can't physically go any further they use some paint to mark down where they finished. Eventually, after hundreds of people have gone, nobody seems to be able to break a certain record set by someone who went before, who managed to go out really far. Everyone considers this to be the furthest that a human can possibly go, until someone proves that they can go further. But when someone does manage to go further, the limit that someone can possibly run is extended to the point where they collapsed. The field has an infinite distance to it, so technically the distance that humans can go is limitless, but there is still a definite point where almost everyone will have collapsed.

Temperature is the same way. Absolute zero was considered the mark in the grass that no substance could pass. Now that something has passed it, a new mark is set down, and the scale of possible temperature increases.

But i'm definitely no scientist, so I have no idea how they managed to do it. And I certainly know nothing about Quantum Mechanics.
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Old 01-11-2015, 08:35 AM   #28 (permalink)
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Well, temperature is just a way of gauging movement in particles (which creates friction, and summarily heat). So absolute zero was the lowest temperature thought possible, as everything ceased to move. But if there are particles than can keep moving beyond it, then the scale of temperature will expand to accommodate it.

Think about it like this: Imagine there's a field of grass that expands infinitely into the horizon. On the field, people run as far as they can, and then when they can't physically go any further they use some paint to mark down where they finished. Eventually, after hundreds of people have gone, nobody seems to be able to break a certain record set by someone who went before, who managed to go out really far. Everyone considers this to be the furthest that a human can possibly go, until someone proves that they can go further. But when someone does manage to go further, the limit that someone can possibly run is extended to the point where they collapsed. The field has an infinite distance to it, so technically the distance that humans can go is limitless, but there is still a definite point where almost everyone will have collapsed.

Temperature is the same way. Absolute zero was considered the mark in the grass that no substance could pass. Now that something has passed it, a new mark is set down, and the scale of possible temperature increases.

But i'm definitely no scientist, so I have no idea how they managed to do it. And I certainly know nothing about Quantum Mechanics.
Absolute zero not being absolute zero, at least for this particular type of matter, is an interesting thought. I can't really tie it with what the article says, but since I don't really get the explanation there, what you say might very well be the right interpretation.
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Old 01-11-2015, 08:47 AM   #29 (permalink)
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Originally Posted by grindy View Post
Not that new, but still...
Oh, and can someone explain this? I consider myself relatively well versed for a layman when it comes to science, but I don't get how it worked at all.

Quantum gas goes below absolute zero
I can't explain it to you, as I'm still trying to fully understand it myself, but this video might be of some interest to you...

NOVA | Making More Stuff
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Old 01-11-2015, 08:51 AM   #30 (permalink)
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Originally Posted by Psy-Fi View Post
I can't explain it to you, as I'm still trying to fully understand it myself, but this video might be of some interest to you...

NOVA | Making More Stuff
The video sadly doesn't work in my country.
I'm trying a proxy, but doesn't seem to work either.
But thanks for the tip, I'll look around whether it's up for downloading somewhere.
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