What consequence occurs if Earth’s atmospheric pressure were suddenly reduced to that of Mars?

Answer

Surface water would boil away at temperatures well below freezing.

Atmospheric pressure is crucial because it stabilizes water in its liquid state across a wide temperature range. A drastic drop in pressure allows water to boil even when the temperature is cold enough that it would otherwise be below freezing.

What consequence occurs if Earth’s atmospheric pressure were suddenly reduced to that of Mars?
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