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Yes they are, if they weren't then how would they be able to go into the fishtanks.

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13y ago

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How do you move water?

Pumps, buckets, tanks.


When a submarine pumps water out of its floatation tanks its density decreases and it floats?

Yes, when a submarine boat pumps water out of its flotation (not floatation) tanks, the submarine should rise.


Why are water storage tanks usually built up on towers or hilltops?

For the pumps


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.


When a submarine pumps water out of its floatations tanks its density decreases and it floats Why does its density decrease?

Because the tanks are filled with air afterwards. Air has a lower density than water.


When a submarine pumps water out of its floatations tanks it density decreases and it floats. Why does its density decrease?

Because the tanks are filled with air afterwards. Air has a lower density than water.


When a submarine pumps water out of its floatation tanks its density decreases and it floats. why does its density decreases?

Because the tanks are filled with air afterwards. Air has a lower density than water.


When a submarine pumps water out of its floatation tanks its density decreases and it floats why does its density float?

Because the tanks are filled with air afterwards. Air has a lower density than water.


When a submarine pumps water out of its floatation tanks its density decreases and it floats. why does its density decrease?

Because the tanks are filled with air afterwards. Air has a lower density than water.


When a submarine pumps water out of its floatation tanks its density decreases and it floats. why its density decreases?

The water is replaced with air which is not as heavy as water for the same volume.


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.


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.