The core of foam nozzle is the design of its internal structure. It uses Venturi effect or mechanical agitation to mix liquid (such as cleaning agent, fire extinguishing agent, pesticide, etc.) with air and fully refine it to form a large number of tiny bubbles. These bubbles are evenly distributed in the liquid, forming a lightweight, volume expanding foam. This conversion not only increases the surface area of the liquid, but also enhances its adhesion and permeability, enabling it to act more effectively on the target surface.