What physical characteristic of the Martian atmosphere causes liquid water to instantly boil away at ambient temperatures?

Answer

Its extremely low pressure, less than one percent of Earth’s sea-level pressure

The near-vacuum state of the Martian atmosphere means the pressure is too low for liquid water to remain stable, causing it to vaporize immediately, regardless of the temperature.

What physical characteristic of the Martian atmosphere causes liquid water to instantly boil away at ambient temperatures?

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