(a) Compare the properties of solids, liquids and gases in tabular form.
(b) Give two reasons for saying that wood is a solid
During class, the students resemble molecules in a solid (because they are very close to one another)
While going from one classroom to another the students resemble molecules in a liquid (because they are a little more farther apart from one another)
And in the playground students resemble molecules in a gas (because they are very, very far apart from one another)
(a)
S.No. | Solids | Liquids | 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 do not fill their container completely | Liquids do not fill their container completely | Gases fill their container completely |
4. | Solids do not flow | Liquids generally flow easily | Gases flow easily |
5. | For example: Ice, coal, wood, stone, iron, etc. | Water, milk, fruit juice, ink, petrol, etc. | Air, oxygen, hydrogen, nitrogen, steam, etc. |
(b) (i) In wood, the force of attraction between the particles is strong. Thus, particles in it are closely packed making it a solid.
(ii) piece or log of wood have an orderly arrangement of the particles due to which wood have a fixed shape and volume. Hence wood is a solid.