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Life jackets that meet safety standards have at least a minimum of 22 pounds buoyancy for adults, and 11 pounds buoyancy for children. A life jacket that has 22 pounds buoyancy or more can support at least 22 pounds of dense material. Since the amount of water in a human body has no weight in water, it follows that a life jacket with 22 pounds of buoyancy can support a 200 pound person.
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