Question

give reason for question no 1

Answer 1

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 completelyin 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

A gas fills the container in which it is kept because the molecules of gas are very very loosely packed and hence the molecules of gas moves in all directions and completely fills the container in which it is kept.