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。

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During the ascent the balloon is constantly widening because of the decrease of atmospheric pressure, and at a certain height it will inevitably burst.

在上升的过程中，随着气压的降低，气球不断膨胀，到一定的高度，气球就会爆破。

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It gives a quantitative relation among the specified burst height, initiation precision, operating reliability and ideal burst height of the fuze used in the intelligent fuze system.

研究了智能空炸引信的引爆概率，导出智能引信系统中所使用引信的标定高度、引爆精度、动作可靠性和引信系统理想炸高之间的定量关系。

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Finally, at a height of almost 19km, the balloon burst and the payload fell back to earth helped along by a parachute.

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