NCERT Solutions for Class 6 Science Chapter 8 - A Journey through States of Water

Water is one of the most essential resources on Earth; it exists in three different forms-ice, water, and water vapour. Chapter 8, A Journey Through the States of Water, introduces students to the fascinating changes that water undergoes in nature through simple, real-life examples. The key processes like evaporation, condensation, melting, freezing, and the water cycle, etc., are all discussed in this chapter.

The NCERT Solutions for Class 6 Science Chapter 8 provide detailed and clear answers to all textbook questions. These solutions will allow you to observe how water behaves in everyday life, including drying clothes, dew on grass, or steam rising from hot food.

Practicing these NCERT Solutions is crucial as it will help students to prepare well for exams and to gain knowledge about all the natural processes happening around them. It will build a strong foundation for future topics in science and help them acknowledge the importance of conserving water and the water cycle in our environment. You can also download the PDF available on the website and make your learning easier.

NCERT Solutions for Class 6 Science Chapter 8 - A Journey through States of Water

Question 1. Which of the following best describes condensation?

(i) The conversion of water into its vapor state.

(ii) The process of water changing from a liquid into a gaseous state.

(iii) The formation of clouds from tiny water droplets.

(iv) The conversion of water vapor into its liquid state.

Answer. The process by which water vapor (gas) in the atmosphere cools and transforms back into liquid water is called condensation. This typically occurs when cool surfaces come into contact with warm, humid air. Condensation is the reason you may have noticed water droplets on the outside of a cold glass.

It is also the cause of cloud formation. Clouds are created when water vapour in the atmosphere cools and condenses into small water droplets. However, keep in mind that condensation really refers to the transition from gas to liquid; hence, option (iv) is the best and most accurate response.

Question 2. Identify in which of the given processes, evaporation is very important—

(i) Colouring with

(a) crayons (b) watercolors (c) acrylic colours (d) pencil colours

(ii) Writing on paper with

(a) pencil (b) ink pen (c) ballpoint pen

Answer. i) (a) Crayons – No liquid is involved, so evaporation is not important.

(b) Water colors – Made by mixing pigment with water. The water needs to evaporate for the colour to dry.

(c) Acrylic colors – These are water-based too, and they dry through evaporation.

(d) Pencil colors – These are solid and do not involve any liquid, so evaporation is not important.

Correct options- (b) and (c)

ii) a) Pencil – It's made of graphite (solid), so evaporation is not involved.

(b) Ink pen – Ink is a liquid, and it dries by evaporation.

(c) Ballpoint pen – The ink is thicker but still a liquid, and it also dries by evaporation.

Correct options- (b) and (c)

Question 3. We see green-colored plastic grass in many places these days. Space around natural grass feels cooler than space around plastic grass. Can you find out why?

Answer: The simple reason why natural grass feels cooler than synthetic grass is that the former emits water into the atmosphere, whereas the latter does not. Transpiration is the mechanism by which natural grass releases water vapor from its surface. As the water evaporates, the surrounding heat is removed, resulting in a colder atmosphere.

Whereas plastic grass is made of synthetic material and cannot release water. It retains heat from the sun and absorbs it, which makes the surrounding air feel hotter. Therefore, natural grass's cooling impact results from its capacity to release water and dissipate heat.

Question 4.

Answer: Some liquids other than water that can evaporate are perfume, alcohol, nail polish remover, petrol, and kerosene. For example, when we spray perfume, it disappears after some time - that means it has evaporated. These liquids slowly turn into gas and mix with the air just like water does when it dries up.

Question 5. Fans move air around, creating a cooling sensation. It might seem strange to use a fan to dry wet clothes since fans usually make things cooler, not warmer. Normally, when water evaporates, it requires heat, not cold air. What do you think about this?

Answer: It's true that evaporation needs heat, but a fan helps speed up evaporation in a different way. When clothes are wet, the water on them needs to turn into water vapor. The fan doesn't make the air warmer, yet it moves the air around. This moving air carries away the water vapor from the surface of the clothes.

When the wet surface is surrounded by dry, moving air, more water can evaporate quickly. So, even though the fan doesn't heat the clothes, it helps remove the water faster by blowing away the moisture in the air.

Question 6. Usually, when sludge is removed from drains, it is left in heaps next to the drain for 3–4 days. Afterward, it is transported to a garden or a field where it can be used as manure. This approach reduces the transportation cost of the sludge and enhances the safety of individuals handling it. Reflect upon it and explain how.

Answer: Sludge is the dirty waste taken out from drains. It is often left near the drain for a few days so that the water in it can dry up. This makes it lighter and easier to carry. When it dries, it also becomes less smelly and safer to touch. Later, it is taken to a field or garden because it can be used as manure, which helps plants grow.

Question 7. Observe the activities in your house for a day. Identify the activities that involve evaporation. How does understanding the process of evaporation help us in our daily activities?

Answer: Here are some things at home that involve evaporation:
- Clothes drying after washing.
- Water drying from the floor after cleaning.
- Sweat drying from our body on a hot day.
- Water in an iron turns to steam while ironing clothes.

Question 8. How is water present in the solid state in nature?

Answer: Water in solid form is called ice. In nature, we find it as
- Snow on mountains
- Hail during storms
- Icebergs in oceans
- Frozen lakes and rivers in very cold places

Question 9. Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.

Answer: This means we must take care of water and not waste it. Water is important for everyone - people, animals, and plants. So before thinking it's just our right to use it, we should remember we also have to protect and save water for others and for the future.

Question 10. The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?

Answer: If the seat is hot because of the sun, you can:
- Pour a little water on it. As the water evaporates, it takes away heat and cools the seat.
- Or you can cover it with a cloth when parking to protect it from getting hot in the first place.

Important Topics in NCERT Solutions for Class 8 A Journey through States of Water

Chapter-wise NCERT Solutions for Class 6 Science

The list of all the chapters included in class 6 science is given below:

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