How do submarines control their buoyancy?

💡 The Answer

• Submarines use ballast tanks that can be filled with water or air to adjust their overall density.
• When tanks are filled with water, the submarine becomes denser than water and sinks.
• Compressed air is used to blow water out of the tanks, reducing density and allowing ascent.
• By precisely controlling the amount of water and air, submarines can maintain neutral buoyancy at any depth.