Last Updated：2025/11/29
At around 19 kilometers above sea level, the Armstrong line marks the boundary where water boils in an unpressurized environment and an unprotected person would need a pressure suit to avoid their bodily fluids boiling away.
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At around 19 kilometers above sea level, the Armstrong line marks the boundary where water boils in an unpressurized environment and an unprotected person would need a pressure suit to avoid their bodily fluids boiling away.
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海抜約19キロメートル付近は、大気圧のない環境で水が沸騰する海抜の高さであり、圧力スーツや加圧環境がなければ無防備な人の体液が沸騰してしまう危険がある境界を示します。
