Gases consist of particles that are widely spaced and move freely, allowing them to be compressed easily without significant resistance. In contrast, solids and liquids have closely packed particles with stronger intermolecular forces, making compression more difficult.
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Gases are highly compressible because their particles are widely spaced and have weak intermolecular forces. In contrast, solids and liquids have closely packed particles with strong intermolecular forces, limiting their compressibility. Gases can be compressed significantly because their particles can be pushed closer together with relatively little force, leading to volume reduction.