Drift potential changes with nozzle pressure.

• A. Increase
• B. Decrease
• C. No change
• D. Completely unpredictable

Answer: (A)

Drift potential depends on droplet size and spray momentum. Increasing nozzle pressure causes the liquid to break into smaller droplets and to exit the nozzle more quickly. These finer droplets are more easily carried by air currents and can travel farther from the target site, so the drift potential rises as pressure goes up. In contrast, lower pressure produces larger droplets that are less prone to drift, and the idea that drift changes unpredictably with pressure isn’t accurate. So, higher nozzle pressure generally increases drift risk. If you need to minimize drift, using lower pressure to produce coarser droplets, along with drift-control practices, helps reduce that risk.