When ultrasound is introduced into a solution, alternating pressure is generated. When the sound wave used for cavitation threshold propagates in the liquid, it can generate cavitation bubbles and significantly improve the mass transfer rate of gas from the solution to the bubbles. Cavitation bubbles are generated by tiny gas nuclei in the solution, and they are generated in the sparse phase of sound waves due to the action of tensile stress (negative pressure). If tensile stress continues to exist after the formation of cavitation, the cavitation bubble will expand to many times its initial size. In this case, the cavitation bubble maintains a spherical structure and continues to grow, vibrate, and collapse. When ultrasound is applied, the gas components in the solution can "directionally diffuse" through the gas-liquid interface and enter the cavitation bubble, which enters the growth stage. When the cavitation bubble collapses on the surface of the solution, the gas will escape from the bubble, resulting in degassing.