Why is an adequate vent necessary in an aircraft pesticide tank?

An adequate vent in an aircraft pesticide tank serves primarily to prevent a vacuum from forming that could disrupt the normal flow of liquid. When a tank is filled with a liquid, it requires a method to allow air to enter as the liquid is withdrawn. Without proper ventilation, a vacuum can form inside the tank as the liquid is pumped out. This vacuum could create resistance against the pump, making it harder for the liquid to flow. Therefore, ensuring a vent is functioning properly is critical for maintaining consistent and efficient flow during aerial applications of pesticides. This, in turn, supports accurate and effective pesticide distribution, contributing to overall application success and safety.