The class 6 NCERT science solutions for chapter 14 given here provides different examples followed by the solved exercises for the students with which they can benefit from while preparing for exams. Detailed explanations are provided by our experienced subject experts as well.
CBSE NCERT Solutions for Class 6 Science Chapter 14:
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: Condensation
(b) Steam rising from wet clothes while they are ironed: Evaporation
(c) Fog appearing on a cold winter morning: Evaporation
(d) Blackboard dries up after wiping its: Evaporation
(e) Steam rising from a hot girdle when water is sprinkled on it: Evaporation
Which of the following statements are ‘True’?
(a) Water vapour is present in air only during the monsoon. (False)
(b) Water evaporates into air from the oceans, rivers, and lakes, but not from 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. (True)
(e) Water vapour condenses to form tiny droplets of water in the upper layer of air, where it is cooler. (True)
Take out a cold bottle of water from the refrigerator and keep it on the table. After some time, you will notice a puddle of water around it. Why?
This is because water vapour near the cold bottle collides with it, becomes cool, and condenses into water droplets. These water droplets collect and form a puddle of water around the bottle.
To clean their spectacles, people often breathe out on glasses to make them wet.
Explain why the glasses become wet.
During exhalation (or breathing out), carbon dioxide is released along with water vapours. If one breathes out glass, the released water vapours collide with the surface of the glass, thereby making it cooler. As a result, the water vapours present in the air surrounding the glass condense and get attached to the glass surface. Consequently, the glass becomes wet.