Perpetual Motion

According to the second law of thermodynamics, perpetual motion is impossible, right?
But how do gas molecules in a closed container move perpetually?
 
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Its really not a closed system. The containers walls are made of atoms/molecules that are in motion as well and outside the system atoms/molecules are in motion.
 
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According to the second law of thermodynamics, perpetual motion is impossible, right?
But how do gas molecules in a closed container move perpetually?
According to the second law of thermodynamics perpetual motion machines are impossible.
 

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