Recently, Professor Zang Duyang's team from the School of Physical Science and Technology at Northwestern Polytechnical University successfully prepared the longest lived bubble on Earth. Under acoustic suspension conditions, the bubble can hold for up to 23 minutes and 36 seconds, and when penetrated by a hot copper needle with a diameter of 0.8 millimeters, the suspended bubble can still remain unbroken. The relevant research paper was published in the international journal "Droplets" and was reported in the "Highlight Research" column of the journal "Nature". This achievement also set a Guinness World Record. The challenge of extending the lifespan of bubbles lies in their unique interface physical and chemical properties, as well as their dynamic behavior. In particular, bubble membranes can provide unique heat and mass transfer boundary conditions and two-dimensional flexible constraints for many specific physical and chemical processes, and have broad application prospects in fields such as materials engineering, fluid physics, life sciences, and environmental sciences. However, due to gravity induced drainage and the large specific surface area of the bubbles themselves, they are inherently unstable. Zang Duyang introduced that common bubbles in nature can only exist for a few seconds and burst upon contact. Their short lifespan and poor stability greatly restrict their application in production and daily life. Extending the lifespan of bubbles has become a challenge for scholars and engineers in fields such as fluid physics and soft matter. Researchers typically use surfactants or micro/nano particles as stabilizers to suppress gravity induced drainage, thereby extending the lifespan of bubbles. However, the addition of chemical stabilizers inevitably leads to the "contamination" of bubbles, so this method is not applicable under specific production conditions. In order to explore the method of obtaining "long-lived" bubbles without introducing chemical stabilizers, researchers have directly used microgravity conditions to suppress liquid discharge on the International Space Station, achieving the stability and longer lifespan of pure water bubbles. So, can we find a bubble stabilization method without introducing chemical stabilizers under ground gravity conditions? This has become an urgent problem to be solved. The team of Zang Duyang, who accidentally discovered the stable bubble, has carried out research on soft matter and complex fluid for a long time. The acoustic levitation technology established and developed by his supervisor Wei Bingbo, an academician of the CAS Member and a professor of Northwestern Polytechnical University, provides new guidance for bubble research. Acoustic levitation is the use of standing wave sound fields between the emitting and reflecting ends to suspend objects such as droplets in the air without falling. This is because the sound radiation force at the wave node can balance the gravity of the object, keeping it suspended. During the interest experiment of "blowing bubbles" with ultrasound, members of Zang Duyang's team proposed a hypothesis: "Since ultrasound can suspend droplets without falling, can it also prevent the liquid in the bubble liquid film from flowing downward?" During the experiment, they accidentally discovered that under acoustic suspension conditions, droplets can transform into bubbles, and the survival time of these acoustic suspended bubbles is significantly longer than that of conventional bubbles. Even more surprisingly, even with a needle used for puncture, these bubbles can still maintain their integrity. Why are bubbles in the sound field so "strong" and "long-lasting"? The Zang Duyang team found that the gravity drainage inside the acoustic suspension bubble membrane was significantly suppressed, thereby endowing the acoustic suspension bubble with super stability. This kind of super stability is due to the unique sound radiation pressure distribution formed by the sound field on the inner and outer surfaces of the suspended bubble. This sound radiation pressure distribution balances the gravity of the liquid, achieves stable suspension of bubbles, and also exerts a squeezing effect on the bubble film. This effect counteracts the hydrostatic pressure, thereby suppressing the gravity drainage phenomenon in the bubble membrane Zang Duyang said that by adjusting the intensity of the sound field, the distribution of sound radiation pressure can also be adjusted, thereby obtaining sound suspended bubbles with different shapes. It is understood that this type of acoustic suspended bubble, which has no solid surface contact, no chemical "pollution", and is ultra stable, is expected to be widely used in many fields. In the future, the Zang Duyang team will continue to conduct relevant research on acoustic suspended bubbles, exploring the surface characteristics, dynamics, and thermodynamic properties of bubbles, and providing theoretical support for the practical applications of acoustic suspended bubbles in materials engineering, fluid physics, life sciences, and other fields. (New Society)