On the basis of physical state, all the matter can be classified into three groups: Solids, Liquids and Gases.
|1.||Solids have a fixed shape and fixed volume||Liquids have fixed volume but they have no fixed shape||Gases have neither a fixed shape nor a fixed volume|
|2.||Solids cannot be compressed much||Liquids cannot be compressed much||Gases can be compressed easily|
|3.||Solids have high densities||Liquids have moderate to high densities||Gases have very low densities|
|4.||Solids do not fill their container completely||Liquids do not fill their container completely||Gases fill their container completely|
|5.||Solids do not flow||Liquids generally flow easily||Gases flow easily|
|6.||For example: Ice, coal, wood, stone, iron, etc.||Water, milk, fruit juice, ink, petrol, etc.||Air, oxygen, hydrogen, nitrogen, steam, etc.|