Chinese Scientists Record Coldest Temperature in Physics
A team led by Chinese researchers has achieved a groundbreaking feat on board China's Tiangong space station by cooling atoms to 10 picokelvins, setting a new record for the coldest temperature ever recorded.
Chinese scientists have made history by achieving a groundbreaking feat on board China's Tiangong space station - cooling atoms to an astonishingly low temperature of 10 picokelvins. This achievement marks the coldest temperature ever recorded in physics, barely above absolute zero.
The experiment utilized "optical tweezers, or more formally known as an optical-dipole trap (ODT), which use laser beams to hold and manipulate atoms. The team successfully placed 20,000 rubidium atoms within the trap, effectively restricting their motion. This controlled environment allowed the atoms to cool down rapidly.
The low-gravity conditions on board the space station further contributed to the cooling effect by minimizing any residual motion of the particles. As a result, the cloud of atoms reached an unprecedented temperature that is extremely difficult to achieve on Earth's surface. Scientists believe this threshold marks the point at which all particles in an object cease movement.
The experiment has significant implications for future research conducted in space, particularly in areas such as quantum simulation and precision measurements. The team reported their findings in a recent paper published in the journal Science, noting that this achievement may stimulate new generations of experiments utilizing ODT technology in space.
Achieving absolute zero is a notion that remains elusive for scientists.
Despite reaching near-absolute zero temperatures in their experiment, researchers acknowledge the unlikelihood of ever attaining true absolute zero.
The third law of thermodynamics suggests that particles would always retain some residual entropy as they approach absolute zero, rendering it theoretically impossible to reach.
According to physicist Saibal Mitra, one version of the third law implies an infinite series of steps would be required to achieve absolute zero, effectively making it unattainable.
The second law of thermodynamics also poses a challenge, stating that entropy always increases, which would be violated if scientists could successfully reach absolute zero.
Reaching absolute zero is often seen as an impossible feat due to the fundamental laws governing thermodynamic behavior.
Mitra further notes that if a heat sink were somehow able to achieve absolute zero, it would enable the creation of 100% efficient machines.
However, space offers a unique environment for cooling atoms, allowing them to float in microgravity and become more efficient at reaching near-absolute temperatures.
In this groundbreaking experiment, Chinese scientists created a quantum state of matter known as a Bose-Einstein condensate, where very cold atoms clump together and behave like a single entity. This unique phenomenon occurs when atoms are cooled to extremely low temperatures, creating a fifth state" of matter.
The achievement is notable for its similarity to previous experiments conducted on the International Space Station and from a weightless fall induced by a drop from a tall tower, where temperatures as low as 52 and 38 picokelvins were recorded respectively. The ability to cool atoms to near absolute zero in space offers a new frontier in scientific research, marking a significant milestone in the quest for understanding the behavior of matter at its most fundamental level.
Facts based on reporting originally published by Live Science.
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