What gas is commonly used as a propellant in pressurized liquids for pesticide application?

Carbon dioxide is commonly used as a propellant in pressurized liquids for pesticide application due to its effectiveness in delivering the pesticide in a fine mist. Its properties allow it to create pressure within the container, forcing the liquid out through a nozzle when activated. Being a non-flammable and low-toxic gas, it provides a safe option for consumers and applicators alike.

Unlike other gases, carbon dioxide is stable and maintains consistent pressure levels, which is crucial for achieving a reliable and even spray pattern during application. Additionally, it can be easily sourced and is relatively inexpensive, making it a practical choice in the agricultural and pest control industries.

Other gases may not provide the same efficiency or safety in this context; for example, oxygen could enhance combustion and is not well-suited for this purpose, while hydrogen, being highly flammable, poses significant safety risks in pressurization scenarios. Helium, while inert, does not possess the necessary properties to function effectively as a propellant for liquid applications like pesticides.