Why do we measure pressure in BAR, PSI, Pa & mmWC? Although all these units measure the same thing — PRESSURE — different industries and applications use different units based on practicality and standards. Pa (Pascal) → SI unit used in scientific calculations BAR → Common in process industries and hydraulics PSI → Widely used in pneumatic & American systems mmWC → Used for very low-pressure applications like HVAC and ducts Understanding these units is very important for instrumentation, maintenance, and automation engineers working with transmitters, gauges, PLCs, and DCS systems. The right unit makes measurements easier to understand, operate, and troubleshoot in real industrial environments. Post navigation Understanding Proximity Switches in Industrial Automation Understanding 4–20 mA Process Value Calculation made simple!
