How do you make a submarine sink and float?


Submarines are able to control their depth via ballast tanks that take on or release water to make the submarine more or less buoyant than the water around it, explains How Stuff Works. This causes the submarine to float or sink.

While at the surface, a submarine floats the same way a ship does. The water they displace is equal to the weight of the ship, which creates a buoyant force that counteracts gravity. However, submarines are different from other ships, because other ships have a set buoyancy and submarines can change how buoyant they are.

Submarines have ballast tanks that can be filled with either water or air. While on the surface, the submarine's tanks are filled with air, just as a ship is. When the crew of a submarine wants to sink, they discharge the air in their tanks and fill the tanks with water. Filling the tanks with water creates a negative buoyancy, and this negative buoyancy causes the ship to sink. The submarine crew can control the angle at which they dive by adjusting the angle of the short wings on the top of the submarine, also called hydroplanes. In case of emergency, submarines carry a supply of compressed air that allows them to return to the surface, should the need arise.

Q&A Related to "How do you make a submarine sink and float?"
1. Fill a bowl with water. Fill a small plastic cup with enough water so when you put the cup in the bowl it only just floats. You may need to experiment to get it just right. This
Submarines use buoyancy to determine their depth. They have tanks that surround the hull that are filled with air or water to control their depth. When they want to go up towards
A submarine changes its buoynacy so it can float on the water surface and cruise below the surface. (The submarine sinks by letting water into its ballast tanks. The submarine floats
The submarine has ballast tanks that can be alternately
1 Additional Answer Answer for: making a submarine sink and float
How to Make a Homemade Submarine That Floats & Sinks
Impress your kids with an interesting educational project to explain how submarines sink and float. Use an empty water bottle and baking powder to create a simple submarine that will sink and float several times before needing to be refilled. Turn your... More »
Difficulty: Moderately Easy
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Submarines float and sink because they have ballast containers which are filled partly with water as well as with air. Water is driven into the tanks to raise ...
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