Question 1

How does water pressure increase with depth?

Accepted Answer

Add ~1 atm per 10 meters (33 feet). At 30m: 4 atm total. At 100m: 11 atm. Scuba limits ~40m recreational.

Question 2

What is the maximum recreational scuba depth?

Accepted Answer

40 meters (130 feet) = ~5 atm total. Beyond requires technical training. Nitrogen narcosis becomes serious.

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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