Final answer:
The statement is true; the check valve in a compressed air sprayer prevents air from entering the supply tube, enabling the sprayer to release only liquid pesticide.
Step-by-step explanation:
The statement that on a compressed air sprayer, the check valve keeps air from entering the supply tube, thus allowing only liquid pesticide to be released from the wand, is True. The check valve's role is to ensure the proper flow of materials, preventing the backflow of air into the supply tube, which could disrupt the spraying mechanism. This is crucial for maintaining system integrity and ensuring that only the intended liquid is dispensed.
In the context of compressed gases and liquids, introducing additional air into a canister increases the pressure due to the gas molecules striking the container's walls more frequently. This heightened pressure must be properly managed to prevent any potential container failure. Conversely, decreased molecules yield a lower pressure. These principles are important for understanding how compressed air sprayers and similar devices operate safely and effectively.