Question 1

What is correct tire pressure?

Accepted Answer

Check door jamb sticker. Cars: typically 32-36 PSI (2.2-2.5 bar). Cold tires only - pressure rises when hot.

Question 2

How does temperature affect tire pressure?

Accepted Answer

Roughly 1 PSI per 10°F change. Check cold tires in morning. Hot summer roads increase pressure.

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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