(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.


51