The water droplets on the glass come from moisture in the air. When warm air touches the cold glass, the water vapour condenses into liquid droplets. This shows condensation.
Class 5 Our Wondrous World – The World Around Us – Chapter 1 Water–The Essence of Life question answer
Class 5 NCERT EVS Our Wondrous World Chapter 1 Water-The Essence of Life solutions
(a) ANSWER:
The small water droplets on the outer surface of the glass come from the moisture present in the surrounding air. When the warm, moist air comes into contact with the cold surface of the glass, the water vapour in the air cools down and changes into water droplets. This process is called condensation and helps us understand how clouds form rain.
(b) ANSWER:
When the ice cubes are left in the glass for some time, they begin to melt because of the surrounding temperature. This shows a change in the state of water from solid to liquid. Heat from the air causes the ice to lose its solid form and become water. This process is called melting and is part of how water changes form.
(c) ANSWER:
If we heat water, it begins to boil and changes from a liquid to a gas, called steam or water vapour. This process is known as evaporation. It happens when the water molecules gain enough energy from heat to break free and rise into the air. This change in state from liquid to gas is part of the water cycle in nature.
For more NCERT Solutions for Class 5 EVS Our Wondrous World – The World Around Us Unit 1: Life Around Us – Chapter 1: Water-The Essence of Life Extra Questions & Answer:
https://www.tiwariacademy.com/ncert-solutions/class-5/evs/