Question 1

What is normal atmospheric pressure?

Accepted Answer

1013.25 hPa = 29.92 inHg = 760 mmHg at sea level, 15°C. Varies with weather and altitude.

Question 2

How does barometric pressure affect weather?

Accepted Answer

High pressure (>1020 hPa): clear, stable. Low pressure (<1000 hPa): clouds, storms. Falling = weather change.

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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