How many feet of saltwater correspond to one atmosphere of pressure?

One atmosphere of pressure corresponds to 33 feet of saltwater. This measurement is critical in diving as it helps divers understand how pressure increases with depth. At sea level, divers experience one atmosphere of pressure due to the weight of the air above them. As a diver descends into water, the weight of the water exerts additional pressure.

For every 33 feet of saltwater, the pressure increases by one atmosphere, leading to a total of two atmospheres at 33 feet (one from the air and one from the water). This principle is essential for divers to comprehend as it directly affects how they manage their gas supply, nitrogen absorption, and overall diving safety. Therefore, recognizing the relationship between depth and pressure is a crucial aspect of scuba diving training and safety.