What is the main principle of how foggers operate?

Foggers function primarily by using mechanical or thermal means to break up liquid pesticides into fine droplets. This process allows for the effective dispersal of the pesticide over a specific area, ensuring that it can reach various surfaces more efficiently and provide better coverage. Different types of foggers employ either mechanical means, such as high-speed rotating discs or nozzles, or thermal methods, which heat the liquid to vaporize it and create a mist. This fine mist is particularly advantageous for penetrating thick vegetation, targeting pests in hard-to-reach locations, and ensuring that the pesticide remains suspended in the air long enough to effectively contact the target pests.

The other choices, while related to the operation of certain types of spraying equipment, do not accurately describe the fundamental operation of foggers. Creating a high-velocity air blast pertains more to other forms of application rather than the specific fogging technique, while low-pressure air systems are not typically used in the context of foggers; they rely on atomization rather than just air pressure. Straining chemicals through narrow openings does not pertain to the fogging process, as foggers focus on breaking down the liquid into small droplets rather than filtering it through physical barriers.