Question 1

What pressure units are most common?

Accepted Answer

PSI (US), bar (Europe), kPa (metric), atm (reference), mmHg (medicine), hPa (weather).

Question 2

How do I choose the right pressure unit?

Accepted Answer

Match industry: PSI for US, bar/kPa internationally, mmHg for blood pressure, hPa for weather.

Question 3

What pressure units do different industries use?

Accepted Answer

PSI in US/UK automotive and HVAC. Bar/kPa in European engineering. mmHg/torr in medicine. Atmospheres in diving and altitude.

Question 4

Is gauge pressure different from absolute pressure?

Accepted Answer

Yes! Gauge pressure reads 0 at atmospheric pressure. Absolute pressure adds atmospheric (~14.7 psi). Vacuum gauge shows negative gauge pressure.

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