In the presence of gravity and pressure difference, the liquid film of the foam will discharge unevenly, and the gas in the bubble will continue to diffuse and penetrate due to the difference in pressure between the two sides of the bubble film, so the instability of the foam itself is mainly Can be reflected from the dynamics. The mechanism of its attenuation mainly includes the diffusion of gas through the liquid film and the discharge of the liquid film. These two properties are inherent properties of the foam itself, and are not related to the presence or absence of surfactants, but these two This kind of attenuation mechanism only plays a significant role in the initial stage of foam system formation. With the attenuation of the foam system, these two effects gradually weaken, making the foam attenuation rate gradually slow down.