The pressure exerted by water at a given depth is determined by the density of the water, the gravitational acceleration, and the depth. The formula for calculating pressure is:
$$P = ρgh$$
Where:
- P is the pressure
- ρ is the density of the water
- g is the gravitational acceleration
- h is the depth
Since saltwater has a higher density than freshwater, it will exert more pressure on objects at the same depth. This difference in pressure can be significant, especially at greater depths. For example, at a depth of 10 meters (32.8 feet), the pressure in saltwater is approximately 1.03 atmospheres (atm), while in freshwater, it is only 1 atm.
This difference in pressure can have several effects on the human body when swimming beneath the surface. First, it can cause the ears to feel blocked or uncomfortable, as the pressure in the middle ear equalizes with the pressure in the surrounding water. Second, it can make breathing more difficult, as the lungs have to work harder to expand against the increased pressure. Finally, it can cause the body to feel heavier and more difficult to move, as the water exerts more force against the body.
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