Gases, as we all know, don't generally offer a lot of resistance. That is, if you try to walk through a cloud of gas, you'll pass right through it. The same is true for two clouds of gases that meet each other: they pass right through each other. But MIT physicists have observed the first exception to the rule by creating two clouds of ultra-cold gases that bounce right off each other like solids.
The researchers had set out to use lithium gas atoms as stand-ins for electrons in models of strongly interacting systems--that is, systems in which atomic particles are likely to collide with each other. They were trying to study the circumstances that cause electrons and other fermions to form a given state of matter.
What they got instead is a surprising phenomenon that could help model and explain the behaviors of systems like neutron stars, high-temperature superconductors, and the quark-gluon soup that existed right after the Big Bang.
To achieve the impenetrable gas effect (our nomenclature, not theirs) the MIT team cooled their lithium isotopes to about 50 billionths of one Kelvin, or a hair's breadth from absolute zero. After separating the gas into two clouds with a magnetic field, the team then used a laser light trap to push them together. But instead of diffusing right into one another as is common (and was expected), they bounced off each other.
The gas clouds aren't exactly impenetrable. They did eventually diffuse into each other, but only after a long second had gone by--which is a pretty lengthy amount of time when you're working at the atomic scale.
But they do have a research potential beyond just being generally interesting (impenetrable gases!). By confining the lithium gas to two dimensions, researchers could simulate the electrons in high-temperature semiconductors--a key technology for creating long-range electricity transmission lines that are efficient enough to support a renewable energy economy. The discovery could also be used to simulate other strongly interacting systems found at much larger scales in the cosmos, like those in neutron stars that are far smaller in size than our sun but pack many times more mass.
Wait... gases cooled to near-absolute-zero acting strangely? Are these not simply Bose-Einstein condensates?
-IMP ;) :)
If someone can kindly refresh my memory...Near 0 K temperatures should have produced ideal behavior, right?
Well, this may just be more evidence for the Bose-Einstein Condensate, a different, lesser-known phase of matter that is supposedly present at extremely low temperatures (such as 50 billionths above absolute zero)
The funny thing about science is that people dedicate their lives to building on top of theories we consider probable. Don't get me wrong, there really is no other way to achieve progress, but if one fundamental theory is incorrect then it shakes everything built on top of it.
This is interesting. Except, they forgot to mention on what pressure they reached this low level of temperature. Since on normal pressure, the lithium "gas" or normally any matter is in solid state. This must have been done in extreme low pressure. And I mean EXTREME, like space vacuum. Only problem is, that at that pressure or temperature, gases barely move, not even at atomic level. But I assume at this level this requires the normal laws of physics to be not valid.
Just a quick calculation: if they really reached the 1/50 billion Kelvin temperature, and the gas was still in gasous state, the pressure it would have required was around 7.32*10^-15Pa. That is low...of course not counting volume decrease, but still, if it is in gasous state, it should not be more than 10 times higher pressure than this.
And if they achived this temperature, this pressure, than one more question. How the hell they can't design structurally stronger buildings?