Question

why does a gas fill completely the vassel
in which it
is
kept ?​

Answer 1

Answer:

Gas fills the vessel completely in which it is kept because the gas particles have less force of attraction and its particles are continuously in motion and hence fill container in which they are kept...

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Answer 2

Answer:

Hey mate here is your answer if any doubt please ask.

Explanation:

In gases there are weak intermolecular force of attraction between the molecules and they have high intermolecular spaces and more kinetic energy which allow the molecules to move in random directions and hence they completely fill the container in which they are kept.

Hope it helps.