Class 6 Science Chapter 8 A Journey through States of Water – NCERT Solutions, Notes & Worksheet

 

Class 6 Science Chapter 8 – A Journey through States of Water

NCERT Curiosity | Class 6 Science | Chapter 8 | NCERT Solutions | 2026–27

📘 Previous Chapter

Class 6 Science Chapter 7 – Temperature and its Measurement

💧 CHAPTER IDEA
Water exists as solid, liquid and gas. Heating and cooling can change water from one state to another.

Clean Notes – A Journey through States of Water

1. Three States of Water

Water is the same substance in different states.

Solid → Ice   |   Liquid → Water   |   Gas → Water Vapour

Ice has a fixed shape. Liquid water flows and takes the shape of its container. Water vapour spreads through available space.

2. Melting and Freezing

Melting: Solid → Liquid on heating.
Freezing: Liquid → Solid on cooling.

3. Evaporation

Evaporation is the change of liquid water into water vapour. It can happen even below the boiling point.

Liquid water → Water vapour

4. Factors That Affect Evaporation

• Larger exposed surface area → faster evaporation
• Higher temperature → faster evaporation
• More air movement → faster evaporation
• Higher humidity → slower evaporation

5. Cooling Effect of Evaporation

Evaporation uses heat from the surroundings, so the surface left behind becomes cooler.

Evaporation → Heat absorbed → Cooling

6. Condensation

Condensation is the change of water vapour into liquid water. Water droplets outside a cold glass come from water vapour in the surrounding air.

Water vapour → Liquid water

7. Boiling

When water is heated strongly, it changes rapidly from liquid into vapour. This is called boiling.

8. Water Cycle

The continuous movement of water between Earth’s surface and the atmosphere is called the water cycle.

Sun’s heat → Evaporation → Water vapour → Condensation → Clouds → Rain / Snow / Hail → Water returns to Earth

9. Water Conservation

Usable water is limited. We should avoid wastage and keep rivers, lakes and other water bodies free from pollution.

Remember: Use water wisely • Avoid wastage • Keep water clean • Reuse water whenever possible

NCERT Class 6 Science Chapter 8 – Question Answers

A Journey through States of Water – Textbook Exercise Solutions

Q1. What is condensation?

Answer: Condensation is the conversion of water vapour into liquid water. The correct option is the one describing water vapour changing into liquid water.

Q2. In which activities is evaporation important: using water colours or crayons, and writing with an ink pen or pencil?

Answer: Evaporation is important when using water colours and when writing with an ink pen because water or another liquid part evaporates after application.

Q3. Why does the space around natural grass feel cooler than around plastic grass?

Answer: Natural grass loses water through transpiration and evaporation. Evaporation removes heat and produces a cooling effect.

Q4. Give examples of liquids other than water that evaporate.

Answer: Examples include alcohol, petrol and perfume.

Q5. Why does a fan help wet clothes dry faster?

Answer: Moving air carries away water vapour from the wet surface. This increases the rate of evaporation and speeds up drying.

Q6. Why is drain sludge often left for a few days before transport?

Answer: Water in the sludge evaporates with time. The sludge becomes drier and easier to handle and transport.

Q7. Name household activities that involve evaporation and explain its usefulness.

Answer: Drying clothes, drying washed utensils and wet floors involve evaporation. Understanding it helps us dry things faster and use cooling methods effectively.

Q8. How is water present in the solid state in nature?

Answer: It occurs as ice and snow, especially in high mountains and polar regions.

Q9. What does “Water is our responsibility before it is our right” mean?

Answer: We depend on water for life, so we must prevent pollution, avoid wastage and protect water resources for present and future use.

Q10. A two-wheeler seat becomes hot in the sun. How can it be cooled?

Answer: Move it to shade and place a wet cloth on the seat. Evaporation of the water removes heat and cools the seat.

Important Extra Questions and Answers

What are the three states of water?
Solid, liquid and gas.

What is evaporation?
The change of liquid water into water vapour.

What is condensation?
The change of water vapour into liquid water.

What is the difference between melting and freezing?
Melting changes solid into liquid; freezing changes liquid into solid.

Why do droplets form outside a cold glass?
Water vapour in the air condenses on the cold outer surface.

What is the water cycle?
The continuous movement of water through evaporation, condensation and precipitation is the water cycle.

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Class 6 Science Chapter 8 Worksheet

A Journey through States of Water – Practice Worksheet

A. MCQs

1. Water vapour changing into liquid water is called:
A. Melting   B. Freezing   C. Condensation   D. Evaporation

2. Which is the solid state of water?
A. Ice   B. Water vapour   C. Steam   D. Rain

3. Which condition generally increases evaporation?
A. More humidity   B. Less air movement   C. Larger exposed area   D. Lower temperature

4. Which process causes cooling?
A. Evaporation   B. Condensation   C. Freezing   D. Melting

5. Liquid water changing into ice is called:
A. Boiling   B. Freezing   C. Condensation   D. Evaporation

B. Fill in the Blanks

1. Water exists in ______ common states.

2. The solid state of water is called ______.

3. Liquid water changes into water vapour by ______.

4. Water vapour changes into liquid water by ______.

5. The continuous movement of water in nature is the ______.

C. True or False

1. Ice and water are different substances.

2. Evaporation can cause cooling.

3. Condensation changes water vapour into liquid water.

4. Greater air movement can increase evaporation.

5. Water is found only as a liquid in nature.

Answer Key

MCQs: 1-C, 2-A, 3-C, 4-A, 5-B

Fill in the Blanks: 1. three, 2. ice, 3. evaporation, 4. condensation, 5. water cycle

True or False: 1. False, 2. True, 3. True, 4. True, 5. False

⭐ QUICK STUDY TIP

Solid → Liquid = Melting
Liquid → Solid = Freezing
Liquid → Gas = Evaporation
Gas → Liquid = Condensation

📚 Related Class 6 Science Notes

Class 6 Science Chapter 6 – Materials Around Us

Source: NCERT Class 6 Science – Curiosity, Chapter 8: A Journey through States of Water, 2026–27.