What does the acronym "PSI" stand for in the context of oil burners?

In the context of oil burners, "PSI" stands for Pounds per Square Inch. This term is critical because it measures the pressure of the oil being used in the burner system. Understanding this pressure measurement is essential for the safe and efficient operation of oil burners, as it impacts the fuel delivery and combustion process. Proper pressure ensures that the burner functions effectively, avoiding issues such as incomplete combustion or system inefficiencies that could lead to operational problems or safety hazards. The other terms listed do not accurately represent the context of pressure measurement in oil burners, which is why they do not apply.