Eli5: How come water can’t survive in thin atmospheres?

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I was watching documentaries about life in outer space for a school project, and in one of the video’s they stated that water can’t survive in thin atmospheres for very long. I always thought that temperature was the only factor that caused water to be liquid, gas or solid, but apparently the density of atmospheres can also determine it’s fase. My question is, how does that contribute?

Sorry in advance if my question is very poorly worded, I’m a 16 y/o with English as their second language.

In: Geology

Anonymous 0 Comments

Pressure is also important for liquids to stay liquid

If you put water in a vacuum chamber and reduce the pressure, the water will boil into vapor regardless of the temperature

Even within our atmosphere, people living at higher altitudes in mountainous cities have to deal with a different boiling point for water- it boils at a lower temperature when you’re at 3000 feet above sea level than it does at low elevation.