why?why a gas always fills the container in which it is cont

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why?why a gas always fills the container in which it is contained?
give me the detail ,please!
从分子学角度分析,就是分子力很弱,微粒之间独自运动,但是我想知道的更明确点.

Because gas particles consist of molecules,the distance between molecules are relatively large compared to liquid and solid.The molecules move in rapid,random and straight-line motion,they move in all diections,and they collide with each other and the walls of the container.Attraction and repulsion is negligible in gas particles.Therefore they fill the container.

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