Which unit is used for the maximum cabin differential pressure?

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The maximum cabin differential pressure is expressed in psi because aircraft pressurization data and instrumentation are traditionally calibrated in pounds per square inch. This unit fits the typical cabin pressure range and keeps documentation, readouts, and maintenance specs consistent with the cockpit instruments. Other units like bar, kPa, or psf are not the standard in most aviation contexts: bar and kPa are metric units not commonly used in standard aircraft manuals, and psf (pounds per square foot) isn’t a practical way to express a differential pressure. So psi is the most appropriate and widely used unit.