Question 1

What pressure units are used in hydraulics?

Accepted Answer

PSI (US), bar (Europe), MPa (metric). Typical hydraulic systems: 3000-5000 PSI (200-350 bar).

Question 2

What is typical hydraulic pressure?

Accepted Answer

Light equipment: 1000-2000 PSI. Heavy equipment: 3000-5000 PSI. Aircraft: 3000-5000 PSI. Injection molding: 10,000+ 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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