Buoyancy "downward" direction. The center of buoyancy of an object is the centroid of the displaced volume of fluid. Archimedes' principle is named after Archimedes of Syracuse, who first discovered this law in 212 B.C. For objects, floating and sunken, and in gases as well as liquids (i.e. a fluid), Archimedes' principle may be stated thus in terms of forces: — with the clarifications that for a sunken object the volume of displaced fluid is the volume of the object, and for a floating object on a liquid, the weight of the displaced liquid is the weight of the object. More
Buoyancy aid are several factors to consider which type to choose. These are designed with high maneuverability as a key feature, often at the expense of buoyancy. Minimalistic designs which tend to hug the body tightly and are well cut around the arms aim to allow the wearer complete freedom of motion (something important to both Slalom and Polo paddlers as well as playboaters). These vests may not be fully suitable for other purposes, such as whitewater paddling where additional buoyancy is required due to the higher flow of water. Canoe polo rules specify that the buoyancy aids must have protective buoyancy