Fish control their buoyancy through the use of a swim bladder, a gas-filled organ inside the body. You can assume that the pressure inside the swim bladder is roughly equal to the external water pressure. A fish swimming at a particular depth adjusts the volume of its swim bladder to give it neutral buoyancy. If the fish swims upwards or downwards, the changing water pressure causes the bladder to expand or contract. Consequently, the fish adjusts the amount of gas in the bladder to restore it to the original volume and reestablish neutral buoyancy. Consider a large, 10.0 kg striped bass swimming in fresh water. When neutrally buoyant, 7% of the total volume of the fish is taken up by air in the swim bladder. Assume a constant body temperature of 15°C and neglect the mass of the air in your calculations. If the fish begins at a depth of 20 meters, what will the volume of the swim bladder be if the fish ascends to a depth of 10 m without changing the quantity of gas in the swim bladder?
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
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