What is the conversion of one atmosphere in terms of feet of seawater?

One atmosphere of pressure is equal to approximately 33 feet of seawater (FSW). This conversion is based on the relationship between pressure and depth in a fluid, such as seawater.

At sea level, the atmospheric pressure is about 14.7 pounds per square inch (psi), and as you descend in seawater, the pressure increases due to the weight of the water above you. Seawater has a density that causes this pressure to increase by about 0.445 psi for every foot of seawater. When you calculate the depth at which the pressure increases to 14.7 psi, you find that it corresponds to a depth of roughly 33 feet.

This understanding is essential in underwater operations and rescue scenarios, as divers and rescue teams need to be aware of the pressure they’ll be experiencing at various depths to ensure safety and proper procedures during underwater activities.