Question

Why does a gas fill a vessel completely

Answer 1

This is because there is little attraction between gas particles. Thus these particles move freely in all directions.Therefore gas completely fill the vessel in which it is kept.

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Answer 2

THE FORCE OF ATTRACTION BETWEEN PARTICAL OF GAS IS NEGLIGIBLE. BECAUSE OF THIS PARTICALS OF GAS MOVES IN ALL DIRECTION.......BECAUSE OF THIS A GAS EXERTS PRESSURE ON THE WALL OF THE CONTAINER IN WHICH IT IS KEPT!