What unit is commonly used to measure air pressure in pneumatic systems?

Pounds per square inch (PSI) is a widely accepted unit of measurement for air pressure in pneumatic systems, particularly in American engineering and industrial applications. This unit represents the pressure exerted by one pound of force applied to an area of one square inch and is commonly used due to its familiarity in various practical contexts, such as tire pressure and compressed air tools.

While other units such as Pascals, atmospheres, and bars are legitimate and used in other contexts, PSI remains the most prevalent in the pneumatic industry, especially in the United States. This familiarity among technicians, engineers, and equipment operators makes PSI a practical choice, simplifying communication and calculations in pneumatic system design and operation.