What is the pressure at one ATA equivalent to in psi?

One ATA, which stands for Atmosphere Absolute, represents the pressure at sea level. At sea level, the standard atmospheric pressure is defined as 14.7 psi. This value is crucial for understanding diving operations because it establishes the baseline pressure that divers experience before descending underwater.

When divers go below the surface, the pressure increases due to the weight of the water above them, but one ATA is the reference point for pressure at the ocean's surface. Therefore, at one ATA, the pressure is equivalent to 14.7 psi, making this the correct answer. Understanding this relationship is essential in calculations related to dive tables, decompression, and the physiological effects of pressure on the human body during diving activities.