Which factor does NOT affect the delivery rate of a sprayer?

The delivery rate of a sprayer is determined by various factors that influence how much liquid is applied over time. The size of the nozzle plays a crucial role because larger nozzles allow for a greater volume of liquid to pass through them, which increases the delivery rate. Similarly, the speed at which the sprayer moves can impact how quickly the liquid is applied to the targeted area; faster speeds can result in a lower delivery rate per area, while slower speeds can increase the amount delivered over a given time.

On the other hand, the temperature of the environment does not directly impact the mechanical delivery rate of a sprayer. While temperature can influence the viscosity of some liquids or the rate at which certain chemicals may react, it does not inherently change the physical mechanics of how the sprayer operates or the volume it delivers in a specified amount of time. Therefore, it is the factor that does not affect the delivery rate of a sprayer when considering the other options closely related to the mechanics of the sprayer itself.