What does 150N mean on a life jacket?

Buoyancy of life jacket 150N refers to the buoyancy of life jacket can be generated by 150 Newtons. This means that the life jacket can help provide enough buoyancy in the water to keep the wearer's head above the water, thus ensuring the wearer's safety. Life jackets are usually made of foam or inflatable devices that provide some buoyancy. The amount of buoyancy depends on a number of factors, including the material, shape, size, and density of the water. Therefore, different life jackets may produce different buoyancy forces. When choosing a life jacket, you need to choose the appropriate amount of buoyancy based on factors such as personal weight, water conditions, and the expected survival time.