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Temperatures such as absolute zero are the same in all reference frames. It's true that an object's overall motion depends on what reference frame you are in (a book on a train will be motionless in the train's frame, but speeding along in the ground frame). And it's true that temperature involves motion. But the motion that is associated with an object's temperature is a different kind of motion from the kind that is affected by a choice of reference frame.
Because the temperature of an object is just an average over the motion energy (kinetic energy) of its atoms relative to each other, there is an absolute temperature minimum beyond which an object can no longer be cooled. This point, where all the atoms have been completely stopped relative to each other, is known as "absolute zero" and corresponds to the number zero on the Kelvin temperature scale. An object cannot be cooled below this point because there is no atomic thermal motion left to stop. If you take a basketball and cool it down to absolute zero, and then throw it, the basketball will still be at absolute zero (you would have to throw it carefully so as to not give it heat in the moment of throwing, and also get rid of the surrounding air which would heat it up due to air resistance). All of the atoms in the basketball will be moving in unison away from you, so there will be non-zero object motion. But all the atoms will not be moving relative to each other, so there will still be zero thermal motion, and therefore zero temperature. Absolute zero is "absolute" both in the sense that no object can get colder, and in the sense that it is the same in all frames.
Absolute zero is a temperature marked by a 0 entropy configuration. It is the coldest temperature theoretically possible and cannot be reached by artificial or natural means. Temperature is an entropically defined quantity that effectively determines the number of thermodynamically accessible states of a system within an energy range. Absolute zero physically possesses quantum mechanical zero-point energy. Having a limited temperature has several thermodynamic consequences; for example, at absolute zero all molecular motion does not cease but does not have enough energy for transference to other systems, it is therefore correct to say that at 0 kelvin molecular energy is minimal. In addition, any particle with zero energy would violate Heisenberg's Uncertainty Principle, which states that the location and momentum of a particle cannot be known at the same time. A particle at absolute zero would be at rest, so both its position, and momentum (0), would be known simultaneously.
It may sound less likely than hell freezing over, but physicists have created an atomic gas with a sub-absolute-zero temperature for the first time1. Their technique opens the door to generating negative-Kelvin materials and new quantum devices, and it could even help to solve a cosmological mystery.
Lord Kelvin defined the absolute temperature scale in the mid-1800s in such a way that nothing could be colder than absolute zero. Physicists later realized that the absolute temperature of a gas is related to the average energy of its particles. Absolute zero corresponds to the theoretical state in which particles have no energy at all, and higher temperatures correspond to higher average energies.
However, by the 1950s, physicists working with more exotic systems began to realise that this isn't always true: Technically, you read off the temperature of a system from a graph that plots the probabilities of its particles being found with certain energies. Normally, most particles have average or near-average energies, with only a few particles zipping around at higher energies. In theory, if the situation is reversed, with more particles having higher, rather than lower, energies, the plot would flip over and the sign of the temperature would change from a positive to a negative absolute temperature, explains Ulrich Schneider, a physicist at the Ludwig Maximilian University in Munich, Germany.
If built, such systems would behave in strange ways, says Achim Rosch, a theoretical physicist at the University of Cologne in Germany, who proposed the technique used by Schneider and his team3. For instance, Rosch and his colleagues have calculated that whereas clouds of atoms would normally be pulled downwards by gravity, if part of the cloud is at a negative absolute temperature, some atoms will move upwards, apparently defying gravity4.
The Cold Atom Lab (CAL) is the first facility in orbit toproduce clouds of "ultracold" atoms, which can reach a fraction of adegree above absolute zero: -459ºF (-273ºC), the absolute coldest temperaturethat matter can reach. Nothing in nature is known to hit the temperaturesachieved in laboratories like CAL, which means the orbiting facility isregularly the coldest known spot in the universe.
The process to create the cold atom clouds starts with lasersthat begin to lower the temperature by slowing the atoms down. Radio waves cutaway the warmest members of the group, further lowering the average temperature.Finally, the atoms are released from a magnetic trap and allowed to expand.This causes a drop in pressure that, in turn, naturally causes another drop inthe cloud's temperature (the same phenomenon that causes a can of compressedair to feel cold after use). In space, the cloud has longer to expand and thusreach even lower temperatures than what can be achieved on Earth - down toabout one ten billionth of a degree above absolute zero, perhaps even lower.
Diaspora Minister Amichai Chikli called Spanish President Pedro Sanchez an "absolute zero" in response to his statement on the Iranian drone attacks on Saturday night."We follow the events in the Middle East with utmost concern. A regional escalation must be avoided at all costs," Sanchez said on social media. "We are in permanent contact with the embassies in the region, which remain active, to serve the Spaniards in the area."Spanish Jewish organization Action and Communication on the Middle East (ACOM) said that his comments were a "shame for all Spaniards" for not condemning Iran's barrage.console.log("2390 BODY2. CatId is:"+catID);if(catID==120)console.log("2390 BODY. YES for anyclip script");var script = document.createElement('script'); script.src = ' -widget/lre-widget/prod/v1/src/lre.js'; script.setAttribute('pubname','jpostcom'); script.setAttribute('widgetname','0011r00001lcD1i_12258'); document.getElementsByClassName('divAnyClip')[0].appendChild(script);else if(catID !== 151) let widgetid = "60fd6becf6393400049e6535";if(catID === 69)widgetid = "65c3a2148772803523c6f41b";else if(catID === 161)widgetid = "65c3a224fb10822a0a7db2dd";console.log("2390 BODY. YES for vidazoo script"); var script = document.createElement('script'); script.src = ' '; script.setAttribute('data-widget-id', widgetid); document.getElementsByClassName('divVidazoo')[0].appendChild(script);if(!document.getElementById("qortex-ext-script"))script = document.createElement('script');script.src = " -id=qAAQHrWEnkO20EfZMXnAw&html-container=vdz[data-view=floater]";script.setAttribute('defer', "defer");script.setAttribute('id', "qortex-ext-script");document.head.appendChild(script); Sanchez "is a pawn of the Iranians, an agent of the ayatollahs," said ACOM.Spain's Israel ambassador responded to People's Party's commentsIsraeli ambassador to Spain Rodica Radian-Gordon did not immediately respond to Sanchez's statement but welcomed People's Party president Alberto Núñez Feijóo's comments on social media. The Israeli Ambassador to Spain, Dr. Rodica Radian-Gordon (credit: NOFAR EFRON . )"We sincerely appreciate your firm stand against the Iranian regime's indiscriminate aggression towards Israel," Radian-Gordon told Feijóo. "Today, the entire free world must stand with Israel against the Iranian axis of evil."Feijóo condemned the Iranian attack as indiscriminate and a threat to the stability in the region. "Spain must work with its allies, without hesitation, to stabilize the situation and avoid further escalation," said Feijóo.
Related TagsIranSpainiran israeldrone attackAmichai Chikli
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Absolute zero is the lowest theoretical temperature, which scientists have defined as minus 459.67 degrees Fahrenheit (minus 273.15 degrees Celsius). That's even colder than outer space. So far, nothing we know of has reached absolute zero. But is it even possible to achieve this chilling milestone?
"[This ratio] gets larger as the temperature goes down and at absolute zero it is actually infinity," Ghosh said. "Quantum phenomena like super fluidity (flow without friction), superconductivity (current flows without any resistance), and ultracold atomic condensation all happen due to this."
But is there any point in trying to cool materials even further? Probably not, according to Foot. "We're much more interested in these quantum effects than reaching absolute zero," he said. "Laser-cooled atoms are already used in the atomic standards which define universal time (atomic clocks) and in quantum computers. Lower-temperature work is still at the research stage, and people are using these methods to test universal physical theories."
"With current instruments, you couldn't tell whether it was zero or just a very, very small number," Foot said. "To measure absolute zero, you would actually need an infinitely accurate thermometer, and that's beyond our current measuring systems."
There are also temperature scales in which zero is absolute zero, the lowest possible temperature. (People have gotten close to absolute zero, but have never reached it. According to theory, we never will.) Absolute zero is at -273.15 Celsius, or -459.67 Fahrenheit.
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