Question

What happen to the space between particles of matter after the following processes? (write increases/decreases/no change)
a) Keeping water in the freezer
b) Heating ghee
c) Water droplets on our body after exposing to wind
d) Formation of rain water from cloud​

Answer 1

(a) The process of changing of water into its vapour is called evaporation.

(b) The process of changing water vapour into water is called condensation.

(c) No rainfall for a year or more may lead to drought in that region. (d) Excessive rains may cause flood.

Question 2:

State for each of the following whether it is due to evaporation or condensation:

(a) Water drops appear on the outer surface of a glass containing cold water.

(b) Steam rising from wet clothes while they are ironed.

(c) Fog appearing on a cold winter morning.

(d) Blackboard dries up after wiping it.

(e) Steam rising from a hot girdle when water is sprinkled on it.

Answer:

(a) Water drops appear on the outer surface of a glass containing cold water: Condensation

(b) Steam rising from wet clothes while they are ironed: Evaporation

(c) Fog appearing on a cold winter morning: Condensation

(d) Blackboard dries up after wiping it: Evaporation

(e) Steam rising from a hot girdle when water is sprinkled on it: Evaporation

Question 3: Which of the following statements are “true”?

(a) Water vapour is present in air only during the monsoon.

(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.

(c) The process of water changing into its vapour, is called evaporation.

(d) The evaporation of water takes place only in sunlight.

(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.

Answer:

(a) Water vapour is present in air only during the monsoon. (False) (b) Water evaporates into air from oceans, rivers and lakes but not from the soil. (False)

(c) The process of water changing into its vapour, is called evaporation. (True)

(d) The evaporation of water takes place only in sunlight. (False)

(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler. (True)

Question 4:

Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?

Answer:

The rate of evaporation increases with increase in temperature. So, near the anghiti or heater, the rate of evaporation will be higher and the uniform will dry up quickly.

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