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They are in various locations around the vessel. normally ( S-boat standard War II type sub ) there are 8 live or usable tanks- the diving sequence is almost always- following the Command- Take Her Down!- Flood l,3,5, and 7, these are the odd numbered tanks located in the forward part of the vessel. Ballast tanks contain water and air- the air used to blow them out for surfacing. do not confuse with fuel tankage. German practice in attacks was to submerge the U-boat mainly on the diaplanes ( Dive planes) and avoid the use of flooding ( this was in the Atlantic or ETO) they were probably afraid of a runaway dive if they used the Ballast tanks. a translated technical manual intended for Sub officers ( German) bears this out. Allied subs were taken down on BOTH the diaplanes ( normally down angle did not exceed 29 degrees) and the Ballast tanks. the Germans preferred using the diaplanes only ( like a fish). so it goes.
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Why do submarines work?
Submarines have ballast tanks in them.........when it has to go deep down, the ballast tanks are filled with water, which increases its average density in regard to water(Relative Density).....and when it has to come up to the surface it empties the ballast tanks...and it rises. That's it.
What is a submarines buoyancy?
A submarine has a variable buoyancy due to it's ballast tanks. When a submarine submerges, it fills it's ballast tanks with water which causes negative buoyancy. When a submarine surfaces, it pumps the water out of the ballast tanks thus giving it positive buoyancy.
How do submarines stay in the water without sinking or submerging?
they are neutrally buoyant. they have ballast tanks to achieve this
What is a ballast tank?
A ballast tank is one of several external or internal tanks fitted in submarines, which allow the boat to submerge when filled with water.
How can submarines float and sink?
Submarines change their depth by use of ballast tanks. To dive, they open their tanks so that they become filled with water. They also angle their dive planes. To surface, they pump the water out of their tanks and fill them with pressurised air.
Why does a submarines density decrease when it pumps air out?
It doesn't pump air out; it forces water out of its ballast tanks to increase its buoyancy.
What are devices used by submarines to control density?
Allowing water into, or discharging it to replace by air, ballast-tanks built into the hull.
Why can a submarine travel both on the surface of the water and underwater?
Submarines have ballast tanks inside them that can be filled with water to make them sink.
What is the ballast on a boat?
Weight used to keep the boat stable in the water. Old seagoing vessels, such as pirate ships use to have ballast stone which was kept in the bottom of the boat down the middle(keel) to keep the boat sitting properly in the water. Modern submarines use saltwater in their ballast tanks(big huge tanks located inside the hull) to enable them to sink and remain submerged
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 do submarine not sink?
As with all boats, a submarine does not weigh as much as the amount of water it displaces. To go under the water's surface, it pumps water into special tanks (ballast tanks), and to rise up again those pumps force the water out of the ballast tanks and back into the sea.Ans 2 - Submarines can go deep and rise again by using water ballast and air pressure, as planned by the captain. -Unfortunately, when things go wrong, submarines DO sink.
How do submarines float sink and stay in the middle of the sea or ocean?
They use ballast tanks to contain sea water or air to control their depth
