Question 1

What units are used for gas pressure?

Accepted Answer

PSI, bar, kPa (metric), atm, mmHg (vacuum systems). Choice depends on industry and region.

Question 2

What is typical gas cylinder pressure?

Accepted Answer

Full oxygen cylinder: 2000-2200 PSI (140-150 bar). CO2: 800-900 PSI. Propane: 100-200 PSI.

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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