Life jackets are standard safety gear for all boating activities, but sometimes people know very little about how they work.Life jackets float due to the science of buoyancy, aiming to achieve the best results of this science.Density the first principle why anything floats is density, or how many substances are filled in a given space.For example, lead is more dense than iron, because lead ingots are more mass than iron ingots of the same size, and therefore have a greater weight.If the total concentration density of the floating body is less than water, the floating body is a floating body or a floating body.For example, although the wood is solid, most forms of wood are floating on the surface of the water because the wood fiber is filled with air bags and the density is lower than that of water.A practical BuoyancyA life jacket needs enough buoyancy to compensate the human body and waterLogin clothing that increases its total density when used.Life jacket design life jacket has two different basic designs, foam core life jacket and air bag life jacket.Both do so and they don't turn into water without damageLog in and lose buoyancy.The exact foam used in the foam plastic life jacket may vary, but they have one thing in common, that is, they are just like wood and are honeycomb by air bags.Plastic solid blocks used to make foam blocks in life-saving equipment sink by themselves, but because foam blocks are made of many bubbles, their total density is much lower than that of water.Another common design for life jackets is to arrange one or more air bags that automatically inflate using carbon dioxide capsules.These hoses may or may not have been manually inflated.The article written by Edwin Thomas has been written since 1997.His work appears in a variety of online publications, including Black Watch, Proboxing-Fans and othersThomas, a travel blogger, editor and writer, traveled from Argentina to Vietnam to find stories.He holds a master's degree in international affairs from an American university.