What is the primary function of compressed air sprayers?

The primary function of compressed air sprayers is to apply pesticides through pressure created by a hand pump. This method utilizes pressurized air to propel the pesticide out of the sprayer in a fine mist or spray pattern, which allows for even distribution over the target area. The design of these sprayers emphasizes the use of pressure to effectively disperse the pesticide, making it easier to cover large or difficult-to-reach areas efficiently.

The other options focus on functions that do not accurately describe the operational mechanism of compressed air sprayers. While some sprayers can hold larger volumes or might be used in fogging applications, the defining feature of compressed air sprayers lies specifically in their ability to utilize air pressure for application, which is not related to long-term storage or mixing of pesticides.