Which of the following factors affects spray droplet size?

The correct answer is that all of the factors affect spray droplet size, as each one plays a crucial role in determining how the pesticide is distributed when sprayed.

Pressure is a significant factor because it determines how forcefully the liquid is expelled from the sprayer. Higher pressure typically leads to smaller droplet sizes, as the increased force breaks the liquid into finer particles. Conversely, lower pressure may result in larger droplets, which can lead to coverage issues and reduced efficacy.

Orifice size is also critical, as the diameter of the nozzle opening directly influences the size of the droplets produced. A smaller orifice will create finer droplets, whereas a larger orifice allows for larger droplets to be formed. This is because the size of the opening dictates the flow rate and the breakup patterns of the liquid.

The physical characteristics of the mixture, including its viscosity, surface tension, and density, also significantly affect droplet formation. For example, a more viscous solution may result in larger droplets because it resists breaking apart as easily as a thinner solution. Surface tension can influence how easily droplets form and break off from the nozzle.

Together, these factors interact in complex ways to influence the overall droplet size of the spray, making it essential to consider all of them