The vapour cone effect is caused by pressure differences around the aircraft. A sudden drop in pressure associated with high speed allows water vapour, which is normally invisible, to condense as fog.

蒸汽锥效应是由于战斗机周围的压力差所导致的，高速飞行时压力的陡然降低会使不可见的水蒸气凝结成雾气。

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Reducing the gas pressure also brings about a sudden drop in temperature, typically from 10c to -30c.

减低气压也会带来温度的骤降，通常是从10度降至零下30度。

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Suitable means shall be provided to prevent back flow of water into steam pipes in case there is any sudden drop in steam pressure.

适当是指应能达到防止水回流到蒸汽管内，导致任何的气压突然下降。

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Birds, which have more rigid and robust lungs, do not undergo the same trauma from a sudden drop in pressure.

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