Which is NOT a basic function of spray nozzles?

The correct choice is that heating the liquid is not a basic function of spray nozzles. Spray nozzles are primarily designed to regulate the flow of liquids, atomize the liquid stream into smaller droplets for effective application, and spread those droplets in a specific pattern to ensure even coverage on the target area.

Nozzles function by controlling the flow rate, which influences how much liquid is discharged and can determine the size of droplets produced. By atomizing the liquid, they help to create a fine mist or spray, which is essential for effective pesticide application, allowing for better coverage and penetration into plant surfaces or pest areas. The ability to spread droplets in a specific pattern also enhances the efficiency of the application, ensuring that the treatment reaches all necessary parts of the target area.

Heating the liquid, however, is not a function of the nozzle itself. While certain applications (like in thermal fogging) may involve the heating of a formulation outside of the nozzle to achieve specific results, traditional spray nozzles do not perform any heating function as part of their operation.