Cartesian Diver

The video explains the principles of buoyancy and weight using a Cartesian diver model. It demonstrates how changing pressure in a sealed bottle affects the diver's buoyancy, causing it to rise, sink, or hover. The experiment uses a plastic straw, sticky tack, and water to create the diver. The video also compares this concept to how submarines use ballast tanks to control buoyancy.

How does the pressure inside the bottle affect the diver's movement?

What role do ballast tanks play in the operation of submarines?

How can the buoyancy of a submarine be adjusted to surface?