Define gas.

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Solution

Gases:
They are also known as fluids, one of the four states of matter.
They do not possess definite shape and definite volume of its own as their molecules can move freely in all directions..
They have least inter-molecular forces of attraction in comparison to solids & liquids.
Hence, show highest inter-molecular spaces in comparison to solids & liquids.
Examples: Air, Oxygen( $O_{2}$ ) gas etc.

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