What causes liquid water to boil vigorously when rapidly exposed to a strong vacuum?

Answer

The boiling point drops significantly as the pressure drops below the triple point.

When pressure rapidly decreases, the boiling point of water also decreases. If the drop is severe enough, liquid water will begin to boil vigorously even at near room temperature because the ambient pressure falls below its current boiling point.

What causes liquid water to boil vigorously when rapidly exposed to a strong vacuum?

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