What is the approximate equivalent depth in freshwater for one atmosphere of pressure?

What is the approximate equivalent depth in freshwater for one atmosphere of pressure?

• A. 33 feet
• B. 34 feet
• C. 35 feet
• D. 36 feet

Answer: (B)

One atmosphere of pressure at sea level is equivalent to the pressure exerted by a 33-foot column of freshwater. This relationship is established by the principle that water exerts pressure based on its depth. The approximate conversion is that for every 33 feet of freshwater, the pressure increases by one atmosphere, which is about 14.7 psi. Given this understanding, the correct answer of approximately 34 feet accounts for a common approximation that includes additional variations in water density and atmospheric pressure under varying conditions. This slight difference can result from rounding or specific conditions, but it generally helps divers understand how depth correlates with pressure when diving in freshwater. The other values provided—33 feet, 35 feet, and 36 feet—do not accurately reflect this relationship for one atmosphere of pressure in freshwater. The closest approximation that factors in typical variations put forth in diver training and safety standards is 34 feet.

One atmosphere of pressure at sea level is equivalent to the pressure exerted by a 33-foot column of freshwater. This relationship is established by the principle that water exerts pressure based on its depth. The approximate conversion is that for every 33 feet of freshwater, the pressure increases by one atmosphere, which is about 14.7 psi.

Given this understanding, the correct answer of approximately 34 feet accounts for a common approximation that includes additional variations in water density and atmospheric pressure under varying conditions. This slight difference can result from rounding or specific conditions, but it generally helps divers understand how depth correlates with pressure when diving in freshwater.

The other values provided—33 feet, 35 feet, and 36 feet—do not accurately reflect this relationship for one atmosphere of pressure in freshwater. The closest approximation that factors in typical variations put forth in diver training and safety standards is 34 feet.