Some characteristics of gases, liquids and solids and the microscopic explanation for the behavior:
gasliquidsolidTakes the shape and volumeTakes the shape of the part of theRetains a fixed volume and shapeof its container and particlescontainer and particlesrigid−particlescan move past one anothercan move/slide past one anotherlocked into placeCompressible: lots ofNot easily compressible:Not easily compressible littlefree space between particleslittle free space between particlesfree space between particlesFlows easily as particlesFlows easily as particles canDoes not flow easily rigid−particlescan move past one anothermove/slide past one anothercannot move/slide past one another