There are several factors that can influence sonic booms -- weight, size, and shape of the aircraft or vehicle, plus its altitude, attitude and flight path, and weather or atmospheric conditions.

有几个因素可以影响音爆——飞行器的重量，大小，形状以及其飞行高度，姿势和路线，还有天气或大气状况。

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WHEN an airliner takes off for a transatlantic flight it needs to carry some 80 tonnes of fuel, which accounts for around one-fifth of its weight.

一架飞越大西洋的飞机大约需要携带80公吨的燃料，这约占飞机重量的五分之一。

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"They almost double their body weight before the flight," Klaassen said. "and all this fat will be burned during the flight, and they will arrive lean and exhausted in Africa."

“飞行前，它们的体重会增加一倍”克拉森说，“当到达非洲的时候，它们会变的瘦弱疲惫，因为所有的脂肪都在飞行途中被消耗掉了”。

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And one of the biggest gas-guzzling factors is in-flight weight.

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The pound-and-a-half weight of a current iPad sheds the tremendous amount of weight that would normally be needed for a conventional in-flight entertainment system built into the headrest, which on a typical 375-seat 767 could see the iPads pay for themselves within years, if not sooner.

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Fuels savings by reducing weight is significant when you include the two pilot bags (50lbs), Cockpit Manuals (25lbs), and Flight Attendant Manuals ( 4 x 25lbs) that the iPAD will eventually replace. 175 lbs is the weight of a person.

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