At roughly 66 feet of seawater, the ambient pressure is approximately how many ATA?

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Multiple Choice

At roughly 66 feet of seawater, the ambient pressure is approximately how many ATA?

Explanation:
Ambient pressure increases by about 1 atmosphere for every 33 feet of seawater. You start at 1 ATA at the surface, then at 66 feet you’ve gained roughly 2 more atmospheres from the water column (66/33 ≈ 2). Add the surface pressure, giving about 3 ATA of ambient pressure. So at roughly 66 feet, the ambient pressure is about 3 ATA. (2 ATA would correspond to about 33 feet, while 4 or 5 ATA would require much greater depths, around 99 or 132 feet, respectively.)

Ambient pressure increases by about 1 atmosphere for every 33 feet of seawater. You start at 1 ATA at the surface, then at 66 feet you’ve gained roughly 2 more atmospheres from the water column (66/33 ≈ 2). Add the surface pressure, giving about 3 ATA of ambient pressure.

So at roughly 66 feet, the ambient pressure is about 3 ATA. (2 ATA would correspond to about 33 feet, while 4 or 5 ATA would require much greater depths, around 99 or 132 feet, respectively.)

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