Skip to main content

Physicists have discovered particles that warp the laws of thermodynamics

Things just got complicated.


According to the basic laws of thermodynamics, if you take a warm apple pie out of the oven and place it on a window sill, it will eventually cool to be the same temperature as the surrounding air.
But physicists have discovered that under certain circumstances, charged particles called ions don’t follow this logic - in fact, they end up cooling to two entirely different temperatures.
"This apparent departure from the familiar laws of thermodynamics is akin to our warm apple pie either cooling as expected, or spontaneously bursting into flames, depending on the pie’s exact temperature when it is placed in the window," says one of the team, Eric Hudson, from the University of California, Los Angeles.
Before trying to observe the hidden quantum mechanical properties of particles, physicists will often cool them right down, because this slows their movements and allows for greater observation and control.
To cool down ions, they use a technique called buffer gas cooling, which effectively 'traps' ions and exposes them to clouds of cold atoms. 
Every time ions collide with the atoms in the clouds, energy is transferred between the two, until eventually the ions and the atoms reach the same cool temperature, in theory, just like our hypothetical apple pie.
At least, that’s what physicists have assumed. But Hudson and his team have, for the first time, shown that reality is far more complicated - and weird.
To test the behaviour of ions in an ion trap, the team prepared a sample of laser-cooled barium ions, and a sample of laser-cooled calcium atoms. Both had been cooled to a mere one-thousandth of a degree above absolute zero.
The ions were then immersed in clouds of around 3 million super-cooled calcium atoms, and held in place by electric fields that oscillate so fast - millions of times every second - that it forces the ions to levitate in a set position smaller than the width of a human hair.
The researchers allowed the super-cooled ions and atoms to mingle and collide with each other in this set-up for a while, and then measured their resulting temperatures.
Instead of finding that the two shared the same temperature, they recorded multiple final temperatures among the ions, which appeared to depend on the number of ions that were cooled at the same moment, and what their exact starting temperature was.
The results suggest that buffer gas cooling is a far more complex process than physicists have realised, and is not able to achieve the temperature equilibrium they were expecting. 
When you've got everyone from forensic investigators to particle physicists who are trying to produce antimatter relying on the effectiveness of this technique, that inconsistency is something they need to account for.
"Our results demonstrate that you can’t just throw any buffer gas into your device - no matter how cold it is - and expect it to work as an effective coolant," says one of the team, Steven Schowalter, from NASA’s Jet Propulsion Laboratory.
The study has been published in Nature Communications.

Comments

Popular posts from this blog

Where the Swastika Was Found 12,000 Years Before Hitler Made Us Uncomfortable About I

Minoan pottery from Crete. The Minoan civilization flourished from 3,000 to 1,100 B.C. (Agon S. Buchholz/Wikimedia Commons) ) Swastika from a 2nd century A.D. Roman mosaic. (Maciej Szczepańczyk/Wikimedia Commons A srivatsa (swastika) sign at Nata-dera Temple, Japan. (Cindy Drukier/Epoch Times) From the Sican/Lambayeque civilization in Peru, which flourished 750 to 1375 A.D. (Wikimedia Commons) Ancient Macedonian helmet with swastika marks, 350-325 B.C., found at Herculanum. (Cabinet des Medailles, Paris/Wikimedia Commons) A Buddha statue on Lantau Island, Hong Kong with a swastika symbol on the chest. (Shutterstock*) A 3,000-year-old necklace found in the Rasht Province of Iran. (Wikimedia Commons) The aviator Matilde Moisant(1878-1964) wearing a swastika medallion in 1912; the symbol was popular as a good luck charm with early aviators. (Wikimedia Commons) A mandala-like swastika, composed of Hebrew letters and surrounded by a circle and a mystica...

20,000 megawatts under the sea: Oceanic steam engines

Jules Verne mused about getting energy from heat in the ocean  (Image: Marc Pagani/Getty) Jules Verne imagined this limitless power source in Victorian times – now 21st-century engineers say heat trapped in the oceans could provide electricity for the world IF ANY energy source is worthy of the name "steampunk", it is surely ocean thermal energy conversion. Victorian-era science fiction? Check: Jules Verne mused about its potential in  Twenty Thousand Leagues Under the Sea  in 1870. Mechanical, vaguely 19th-century technology? Check. Compelling candidate for renewable energy in a post-apocalyptic future? Tick that box as well. Claims for it have certainly been grandiose. In theory, ocean thermal energy conversion (OTEC) could provide  4000 times the world's energy needs in any given year , with neither pollution nor greenhouse gases to show for it. In the real world, however, it has long been written off as impractical. This year, a surprising number of pro...

There’s a Previously Undiscovered Organ in Your Body, And It Could Explain How Cancer Spreads

Ever heard of the interstitium? No? That’s OK, you’re not alone  —  scientists hadn’t either. Until recently. And, hey, guess what  —  you’ve got one! The interstitium is your newest organ. Scientists identified it for the first time because they are better able to observe living tissues at a microscopic scale, according to a recent study published  in  Scientific Reports , Scientists had long believed that connective tissue surrounding our organs was a thick, compact layer. That’s what they saw when they looked at it in the lab, outside the body, at least. But in a routine endoscopy (exploration of the gastrointestinal tract), a micro camera revealed something unexpected: When observed in a living body, the connective tissue turned out to be “an open, fluid-filled space supported by a lattice made of thick collagen bundles,” pathologist and study author Neil Theise  told  Research Gate . This network of channels is present throughout ...