氦气飞艇

1
气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
The pressure of the helium inside a blimp is about the same as that of the air outside, so the gas does not rush out.
2
此外，就算被刺穿了，它们通常也能留在高空：气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
Moreover, they usually stay aloft even when punctured: the pressure of the helium inside a blimp is about the same as that of the air outside, so the gas does not rush out.
3
Hindenburg号爆炸事件表明采用氢气作为飞艇的填充气非常危险，但新的填充气采用氦气——一种不可燃气体，而不是终止采用飞艇技术。
The explosion of the Hindenburg showed the dangers of hydrogen as a lifting gas and resulted in new emphasis on helium, which is not flammable, rather than ending the reign of rigid airships.

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