Question

why do gases fill up completely the vessel in which they are kept​

Answer 1

Explanation:

because the particles of a gas have high kinetic energy and they move in all possible directions

because their exist particular have no force of attraction between them . therefore the gas fills the vessel in which they kept.

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Answer 2

Explanation:

Gaeses have less intermolecular farce due to which the particles can move freely in all directions. hence the gases feel completely the vessel in which they are kept in.