Question

a gas fills completely the vessel in which it is kept give reason​

Answer 1

Ello user !!!!!!!

Here is your answer,

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The force of attraction between particles of gas is negligible.

Because of this, particles of gas move in all directions.

Thus, a gas fills the vessel completely in which it is kept.

Because of this a gas exerts pressure on the walls of the container in which it is kept.

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Answer 2

Answer:

It is so because gasses have no fixed volume and undergo diffusion very fast.

Explanation:

As gasses undergo diffusion the fastest, it quockly moves from regions of high concentration to regions of low concentration and therefore completely fills the vessel.