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the buoyant force on an object in fluid is an upward force equal to the weight of the fluid that the object takes the place of, or displaces
Why do helium balloons float and balloons filled with carbon dioxide don't?
helium is less dense than air while carbon dioxide is more dense than air
How can a steel ship float when steel has a higher density than water?
the ship's hull is shaped so that the ship has a larger volume and therefore a smaller density
How do you make a submarine sink?
Fill the ballast tanks with water to increase the density of the submarine
How do you make a submarine rise?
Pump air into the ballast tanks to decrease the density of the submarine
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