How many PSIG does every foot of water exert, regardless of depth?

The correct answer reflects the established principle in diving and fluid dynamics that every foot of water exerts approximately 0.445 pounds per square inch gauge (PSIG) of pressure. This value is rooted in the definition of pressure in fluids, where water exerts additional pressure as depth increases.

Understanding this pressure relationship is crucial for dive supervisors and divers alike as it aids in calculating total pressure experienced at various depths. Specifically, this means that at a depth of one foot, the pressure increase is 0.445 PSIG, and this pressure will accumulate as one descends deeper into the water.

This understanding is essential for safe diving practices, as it allows divers to account for pressure changes that can impact buoyancy, decompression, and overall dive safety.