Solids, Liquids And Gases

GASES:

The molecules of a gas have the maximum movement (or maximum kinetic energy). Due to this, the gases have the most disorder arrangement of molecules. Because of high kinetic energy and negligible forces of attraction, the molecules of a gas move with high speed in all directions. When the fast moving gas molecules hit the walls of the container, they exert a pressure (called gas pressure). Thus, a gas exerts a pressure on the walls of its container. The pressure exerted by a gas is due to the collisions of the fast moving gas molecules against the walls of the container. When a gas is put in an empty container, it quickly spreads throughout the container and fills it completely. 

1.  A gas does not have a fixed shape                2.  A gas does not have a fixed volume 
3.  A gas can be compressed easily                    4.  A gas has very low density 
5.  A gas fills its container completely                 6.  A gas flows easily. 

Ex:Air, Oxygen etc....