how does density effect a scuba diver?

Question

please give a detailed answer.

Answer 1

Relative density is what is important. ie the diver's density relative to water.

As you may expect, the diver has a lower relative density and, therefore, needs a weight belt to increase his rd. to submerge. To surface he inflates his buoyancy suit, this increases his volume and decreases his rd.

Answer 2

When you are underwater, the pressure of the water has a significant effect on the air that the diver is breathing. For every 44 feet underwater that you are, you are adding the pressure of an extra atmosphere. For example, at sea level, pressure is approximately 15 psi, at 44 feet below water, it is approximately 30 psi, at 88 feet approximately 45 psi and so on.
The air supplied to the diver through the regulator is delivered at the pressure of the surrounding water, so if yo uare 44 feet below water, the pressure of the air delivered is 30 psi.
If you took a baloon that contained 1 cubic foot of air at sea level down to 44 feet, that air would be compressed to 0.5 cubic feet (the density is now doubled). If you took it down to 88 feet, it would be compressed to 0.333 cubic feet (the density is now tripled).
From a practical standpoint, the diver would use air twice as fast at 44 feet than at sea level due to this increase in density, or three times as fast at 88 feet.
Of even more importance to a scuba diver, if you went to 88 feet and blew up a baloon to one cubic foot using air from your lungs, and then began to surface, the air would expand as water pressure decreases. At sea level, there would be three cubic feet of air in the baloon.
If you were to fill your lungs at 88 feet (45 psi) and then ascend to sea level (15 psi) while holding your breath, the expanding air would cause severe damage to your lungs and quite possibly kill you.

One of the cardinal rules for scuba divers is "NEVER HOLD YOUR BREATH WHILE DIVING" and this is the reason why.

Answer 3

Density of what? Water? Air?

Density of seawater is lower compared to ordinary water, hence divers tend to ascent most of the time. It makes diver hard to control their buoyancy. The saltier the seawater, the harder to maintain buoyancy.

Answer 4

lobster