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The branch of applied physics which deals with the motion of projectiles and the conditions governing their motion. Ballistics is, for practical purposes, subdivided into exterior and interior ballistics. Exterior ballistics begins at the instant a…

An explosion whose energy is produced by a nuclear transformation, either fission or fusion. Nuclear explosions can be either natural or artificial, for example in the form of a star undergoing a supernova or the deliberate detonation of an…

A ship that can operate completely submerged in the water. The term "submarine" formerly applied to any ship capable of operating completely underwater, but now usually describes a ship built for military purposes (Fig. 1). The expected military…