How much gas is in solution at 1 ata and at 165 fsw?

At 165 feet of seawater (fsw), the pressure increases significantly compared to sea level, where standard atmospheric pressure is considered 1 ata (atmosphere absolute). At 165 fsw, the total pressure can be calculated by considering that every 33 feet of seawater adds about 1 ata to the pressure. Therefore, at 165 fsw, the pressure in ata would be approximately 1 ata (atmospheric pressure at sea level) plus 5 ata (due to the depth), resulting in a total of about 6 ata.

Under these conditions, the amount of gas dissolved in a liquid (like seawater for scuba divers) can be calculated using Henry's law, which states that the amount of gas dissolved in a liquid is proportional to the pressure of the gas above the liquid. The specific solubility of gases, such as oxygen or nitrogen, in seawater can vary, but generally at higher pressures, more gas can be held in solution.

The correct answer of 5 liters indicates that as the depth increases and the pressure rises, gases will dissolve in greater quantities compared to the surface, aligning with Henry's law. Thus, at 165 fsw and at 6 ata, the data suggests