How Life Jackets Work

The video explains how life vests work by using Archimedes' principle, which states that an object submerged in water displaces water equal to its mass. The buoyant force, which is the upward push from the water, helps objects float. The video compares a marble and a ping pong ball to illustrate density and buoyancy. It also discusses human buoyancy and how life jackets provide additional lift to keep a person afloat. Life jackets use materials like plastic foams with closed cells to trap air and enhance buoyancy.

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