Why is stable liquid water currently untenable on the surface of Mars?
Answer
The atmospheric pressure is too low, causing rapid sublimation or instant boiling.
The surface environment of Mars is characterized by extremely low atmospheric pressure and frigid temperatures. If water were to exist briefly on the surface, the ambient pressure is insufficient to maintain the liquid state. Instead, the water undergoes sublimation, transitioning directly from ice into vapor, or it boils rapidly away due to the low pressure, preventing the formation of stable bodies like puddles or lakes.
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