Ways to lose Atmospheric Gas from ....

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Ways to lose Atmospheric Gas

Back (Answer)

Gas sticks around

condensation - gas turns into liquids or ices on the surface when cooled
chemical reactions - gas is bound into surface rocks or liquids

Gas is lost forever

stripping - gas is knocked out of the upper atmosphere by solar wind particles
impacts - a comet/asteroid collision with a planet can blast atmospheric gas into space
thermal escape - lightweight gas molecules are lost to space when they achieve escape velocity

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