alleryStart learning →Every 33 feet of descent in salt water adds how much pressure for a diver?
AAbout 0.5 ATA
BAbout 2.0 ATA
CAbout 1.0 ATA
DAbout 3.3 ATA
Answer & Solution
Correct answer: C. About 1.0 ATA
1. Divers quote pressure as atmospheres absolute, or ATA, counting everything pressing down on them.
2. At the surface a diver already carries 1 ATA from the air above.
3. Each further 33 feet of salt water adds another 1 ATA.
4. So at 33 feet the total is 2 ATA, which compresses the breathed air to half its surface volume and uses the tank up twice as fast.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.2 Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law_
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