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In solids particles are closely packed and can vibrate about their mean positions only. Hence solids do not flow and are rigid and have definite shape and volume .The interparticle space between the particle is minimum and the interparticle attraction between the particles is maximum.

Liquids 

In liquids ,particles are comparatively less compact and the molecules are free to move within the liquid ,but do not leave the liquid .Hence liquids can flow,have a definite volume and are less rigid .The interparticle space between the particles is slightly more than that of solids .The inter-particle attraction is less compared to solids .

In gases,particles show minimum compactness and particles are free to move in any direction ,hence can fill in any direction and can fill in any space .Gases have no definite shape or volume ,can flow and are easily compressible .The inter particle space between the particle is maximum and the interparticle attraction is negligible .