It gives a quantitative relation among the specified burstheight, initiation precision, operating reliability and ideal burstheight of the fuze used in the intelligent fuze system.
An air burst is an explosion in which a weapon is detonated in air at an altitude below 30 km but at sufficient height that the fireball does not contact the surface of the earth.
空中爆炸指的是核爆发生在海拔30公里以下，且火球有足够高度不接触到地面。
3
During the ascent the balloon is constantly widening because of the decrease of atmospheric pressure, and at a certain height it will inevitably burst.