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Air is trapped in the ballast tanks which surround the boat. This makes it positively bouyant (why it floats). To submerge the boat the air is vented out of the tanks via the main ballast tank vents which are at the highest point in the tank. As the air escapes seawater comes into the tank through the flood grates located at the bottom of the main ballast tanks. This makes the boat heavier or negatively bouyant and causes it to sink. Once submerged then the crew adjusts the weight of the boat (called trimming the boat) so that it is as close to neutrally bouyant as possible.
What else can I help you with?
Why do submarines submerge?
To control its buoyancy, the submarine has ballast tanksand auxiliary, or trim tanks, that can be alternately filled with water or air. When you fill it with water, it sinks, When you first let the water out then you let the air in (from compressed air in the submarine) it floats.
Where does the ability of an object to float or submerge in water depends on?
ability of an object to float or submerge depends upon the density of the object and on the density of the liquid in which it is submerged if the density of an object is greater than the density of the liquid then the object submerges in the liquid and when its density is less than the density of liquid then it floats on the liquid as in submarines when it takes water in its hollow tank its density increases and it submerges and when it pushes out water from its hollow tanks its density decreases and ot floats on water
How submarine floats up and down?
A submarine controls its buoyancy by adjusting the amount of water in its ballast tanks. To submerge, it fills these tanks with water, increasing its weight and allowing it to sink. To ascend, it pumps air into the tanks, forcing the water out and decreasing its weight, enabling it to float back up. This process allows submarines to maneuver effectively underwater and at the surface.
What is the difference between a normal ship and a submarine?
Normal ships are designed to move on the surface of the water. Submarines are designed to be able to submerge and travel under the water's surface, as well as on the surface. When normal ships go down, they stay down. Submarines are able to come back up after they go down. All American submarines are nuclear powered. With the exception of Aircraft carriers, surface ships are powered conventially.
How do submarines control their density?
By their pumps and ballast-tanks: allowing water into the tanks to raise the vessel's density so can submerge, or pumping air into the tanks to displace the water and allow the submarine to surface.
Why does the submarine float and submerge in water?
Submarines must be able to float to load and offload crew and cargo and to have repairs and maintenance. They are designed to submerge either for underwater exploration or to pass undetected by ships at the surface and planes and satellites above.
When water fills a submarines flotations tanks the overall density of the submarine?
The density will rise and submerge the submarine.
What is the maening of submerge?
to sink below the surface of water
How does a submarine floats then sinks then floats?
It is a matter of buoyancy. There are large tanks that can be filled with sea water or with air. To submerge they pump the air into compressed tanks and the water fills it up sinking the sub. When they want to go back up, they blow the water out using the compressed air.
What floats on or near the surface of the water?
PLANKTON
Why water hyacinth floats on water surface?
a green liquid
How the ship floats on sea?
Displacement - the ship displaces an amount of water equal to its weight. Provided that this dowes not submerge the vessel, it will float.
