"2,500 psi" stands for "2,500 pounds per square inch," a unit of pressure measurement. It indicates how much force is applied over a specific area. For example, in hydraulic systems, this level of pressure can be used to operate machinery or tools effectively. In everyday contexts, pressure washers often operate around this level, allowing them to clean surfaces like driveways and patios efficiently. Understanding psi is crucial for ensuring safety and effectiveness in various applications, from industrial machinery to home cleaning equipment.