What is the absolute pressure expressed in terms of atmospheres absolute at 33 feet in sea water?

At a depth of 33 feet in seawater, the concept of absolute pressure is essential for understanding how pressure increases with depth. Underneath the surface of the water, pressure increases due to the weight of the water above.

For every 10 meters (or approximately 33 feet) of seawater, the pressure increases by 1 atmosphere (ata). This is the equivalent of the pressure exerted at sea level, which is about 1 ata. Therefore, when you reach a depth of 33 feet, you are experiencing the pressure of the water above you as well as the atmospheric pressure present at the surface.

At 33 feet, the pressure can be calculated as follows: the pressure at the surface (1 ata) plus the pressure due to the water column (1 additional ata). As a result, the total or absolute pressure at that depth is 2 ata.

This understanding is critical for divers, as it affects buoyancy, gas absorption, and safety during dives.