What is the pressure change per foot of depth in freshwater?

In freshwater, the pressure increases by approximately 0.433 psi for every foot of depth. This value is derived from the basic principles of fluid statics, where one atmosphere of pressure (about 14.7 psi) is exerted by the weight of the air above us at sea level. The weight of the water column contributes additional pressure as you descend.

Given the choices, the closest value to this increase in pressure per foot of depth in freshwater is 0.432 psi. This is crucial for divers to understand because it helps them anticipate the changes in pressure they will experience as they dive deeper. Proper awareness of pressure changes is vital for safety, as it affects buoyancy, breathing, and potential risk for conditions such as decompression sickness.

Hence, the answer given aligns closely with the recognized standard for pressure change in freshwater environments, making it the most accurate choice among the options provided.