PADI Divemaster Certification Practice Exam

What is the ambient pressure at a depth of 10.3 meters in fresh water?

1. 1 bar/ata

2. 2 bar/ata

3. 3 bar/ata

4. 4 bar/ata

The correct answer is: 2 bar/ata

To determine the ambient pressure at a depth in freshwater, it's important to understand how pressure increases with depth. In any fluid, pressure increases linearly as you go deeper due to the weight of the water above you. At sea level, the pressure is 1 atmosphere (approximately 1 bar). For every 10 meters of water depth, the pressure increases by about 1 atmosphere. So, for fresh water, the pressure increase will be: - At 0 meters (surface): 1 bar (atmospheric pressure) - At 10 meters: 1 bar (atmospheric pressure) + 1 bar (increase due to 10 meters of water) At 10.3 meters, the calculation shows that the pressure would be approximately: 1 bar (atmospheric pressure) + 1 bar (from the first 10 meters) + a small amount more for the additional 0.3 meters. The overall pressure at this depth approximates to approximately 2 bar/ata (1 bar from the atmosphere and about 0.03 bar from the additional depth). Therefore, the total ambient pressure at a depth of 10.3 meters in fresh water is indeed 2 bar/ata. This is essential knowledge for