States of Matter

Science — Second Preparatory

Diffusion and compression

Comparison aspect	Main idea	Keywords
Diffusion	is the movement of particles from a region of higher concentration to a region of lower concentration because of their random motion. Diffusion is faster in gases than in liquids and faster in liquids than in solids because particles in gases move more freely	movementparticlesregionhigher
Compression	is reducing the volume of a substance by applying pressure. Gases are easily compressed because the spaces between their particles are large. Liquids and solids hardly change their volume under pressure because their particles are already packed close together	reducingvolumesubstanceapplying

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