What is the atmospheric pressure at sea level?

The atmospheric pressure at sea level is defined as 14.7 pounds per square inch (psi). This standard atmosphere value is used in various scientific and engineering applications, including scuba diving, to help divers understand how pressure changes as they descend underwater.

Understanding this baseline is crucial for divers because as they go deeper into the water, the pressure increases significantly. For every 33 feet of seawater (or about 10 meters), the pressure increases by roughly an additional 14.7 psi. This knowledge helps divers calculate their depth-related exposure to pressure and manage Boyle's Law, which describes the inverse relationship between volume and pressure in gases.

The other options do not correspond to the standard atmospheric pressure at sea level, which is why they are not correct.