Matter can be in the form of a liquid, solid or gas. Each of these types of matter have certain specific properties that identify it as a liquid, solid or gas. Gases have specific properties including having a low density.
The molecules in a gas are scattered about and are not tight or compact. Therefore, the gas is not dense. Also, the gas does not have a specific shape. Since the molecules are not compact, it would not form a shape or have a certain type of volume.
Gases also allow it to be compressible and expandable. Since there is low dense, the gas can be compressed. Diffusion is also something that can happen to a gas due to its configuration. There is high pressure in a gas.
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