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
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