Neutral buoyancy diver maintains neutral buoyancy by continuous correction, usually by controlled breathing, as neutral buoyancy is an unstable condition for a compressible object in a liquid. The mathematician Archimedes discovered much of how buoyancy works more than 2000 years ago. In his research, Archimedes discovered that an object is buoyed up by a force equal to the weight of the water displaced by the object. In other words, an inflatable boat that displaces 100 pounds (45 kilograms) of water is buoyed up by that same weight of support. An object that floats in the water is known as being "positively" buoyant.
Buoyancy aid at the sides of the garment, resulting in a garment that has more overall coverage Buoyancy aids for sea and long distance touring often feature several large pockets for storing essential equipment, and many also accommodate hydration packs. They have to be comfortable to wear whilst paddling for long distances, and so typically have very low cut sides to allow the arms free movement. More recently they are being designed more and more like whitewater vests, with low cut fronts to allow the paddler to lean forward easily. Whitewater buoyancy aids are designed to provide enough buoyancy in fast whitewater