Question

Give two reasons to justify that :
(a) water at room temperature is a liquid
(b) an iron almirah is a solid at room temperature.

Answer 1

(a) Water is a liquid at room temperature (25°C) due to the following reasons :
(i) When placed in a beaker, its level cannot be changed on pressing.
(ii) It can take the shape of any container in which it is placed.

(b) An iron almirah is a solid due to following reasons :
(i) Its shape does not change when pressed. This means that it is hard and rigid.
(ii) It is very heavy. This means that its density is very high.