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.
Principles of war Military College of Canada or Canadian Forces College website to focus on "principles of command", "principles of war", "operational art and campaign planning", and "scientific principles". The French Army recognizes three principles to be applied to operation of land forces at the tactical level: According to French doctrine, new principles should be observed, primarily to protect the principle of "Freedom of Action": The principles of war according to Israeli doctrine are: The military principles of war of the People's Liberation Army were loosely based on those of the Soviet Union until the 1980s when a significant shift begun to be