What does PSI stand for?

PSI stands for "Pressure exerted on a surface," which is a common unit of measurement for pressure. The abbreviation comes from "pounds per square inch," indicating the amount of force (in pounds) applied to each square inch of a surface. Understanding PSI is crucial in various engineering applications, as it helps in measuring how much pressure a system can handle, ensuring safety and efficiency in operations involving fluids and gases.

In the context of stationary engineering, knowing how to measure and interpret PSI plays a significant role in maintaining equipment, such as boilers and compressors, where pressure levels are critical for safe and effective functioning. Properly understanding these measurements also aids in troubleshooting and performing routine maintenance.

The other choices represent terms that may sound relevant but do not specifically define what PSI stands for in the context of pressure measurement. Recognizing the correct definition is important for both practical applications and theoretical knowledge in engineering practices.