Acoustic levitation is a technique that uses sound waves to lift small objects without any physical contact. By generating high-frequency sound waves, researchers create standing waves that produce areas of high and low pressure. When an object is placed in the right position, the pressure from the sound waves can counteract gravity, allowing the object to float in mid-air. This method has various applications in science and technology, including materials science and pharmaceuticals. For instance, it can be used to study the properties of materials in a controlled environment or to handle delicate substances without contamination, making it a valuable tool in modern research.