What is the approximate pressure at 33 feet of seawater?

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Prepare for the ADCI Dive Supervisor Certification Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Ace your exam!

Multiple Choice

What is the approximate pressure at 33 feet of seawater?

Explanation:
In diving, ambient pressure increases with depth, roughly one atmosphere of pressure for every 33 feet of seawater. At the surface you’re at about 1 atmosphere absolute. Traveling to 33 feet adds another atmosphere from the water, bringing the total to about 2 atmospheres absolute. So the approximate pressure at 33 feet is 2 ATA (about 29.4 psi). The other options would correspond to shallower or deeper depths: 1 ATA is surface, 3 ATA around 66 feet, and 4 ATA around 99 feet.

In diving, ambient pressure increases with depth, roughly one atmosphere of pressure for every 33 feet of seawater. At the surface you’re at about 1 atmosphere absolute. Traveling to 33 feet adds another atmosphere from the water, bringing the total to about 2 atmospheres absolute. So the approximate pressure at 33 feet is 2 ATA (about 29.4 psi). The other options would correspond to shallower or deeper depths: 1 ATA is surface, 3 ATA around 66 feet, and 4 ATA around 99 feet.

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