What function does planetary atmospheric pressure serve in the context of habitability?
Answer
It is necessary to keep water in a liquid state rather than allowing it to sublimate or freeze
Atmospheric pressure is critical for the phase state of water on a planetary surface. If the pressure is too low, water cannot maintain a liquid form and will instead sublimate directly into gas or freeze solid. An adequate atmosphere is required to maintain the pressure levels that keep water liquid at specific temperatures. Without this, even if a planet is at the correct distance from its star, the lack of pressure would render the presence of liquid water impossible.
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