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. NCERT Class 6 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 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.

NCERT Solutions for Class 6 Science Chapter 8: Download PDF

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NCERT Solutions for Class 6 Science Chapter 8

Question 1. Which of the following best describes condensation?

(i) The conversion of water into its vapour 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 vapour into its liquid state.

Answer:

The process by which water vapour (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 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. The space around natural grass feels cooler than the 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. Give examples of liquids other than water that evaporate.

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:

Evaporation indeed 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 is drying from our bodies on a hot day.
• Water in an iron turn 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.

Practice Questions for Class 6 Science Chapter 8

Question 1: What is Evaporation? Also, name factors that increase Evaporation.

Answer:

It is the process of the change of the state of substance from liquid into gas without reaching its boiling point.

Factors that increase the rate of evaporation are:

• Speed of wind
• Temperature

Question 2: Explain Condensation.

Answer:

Condensation is the process in which water vapour cools down and changes into a liquid state. An example of condensation is the formation of water droplets on the outer surface of a cold-water bottle.

Question 3: What is the reason ice floats on water?

Answer:

The density of ice is less than that of water; due to this density difference, the ice floats on water.

Question 4: How does water change from liquid to gas?

Answer:

Through Evaporation and Boiling, water changes from liquid to Gas.

Evaporation: The process of evaporation occurs at any temperature below the boiling point and only at the surface of the liquid.

Boiling: Occurs when water is heated to 100 °C.

Question 5: What is the water cycle?

Answer:

The process of water circulation between Earth and the atmosphere is the water cycle. And it is a continuous process.

This process involves 3 states of water:

• Liquid
• Gas
• Solid

Approach to Solve NCERT questions for Class 6 Science Chapter 8

Below are the steps that can be used to solve the Class 6 Science chapter 6 questions effectively:

1) Firstly, students need to read this chapter carefully and note or underline the important topics like:

• States of matter
• Properties of matter

2) Must pay special attention to processes like:

• Melting
• Boiling
• Sublimation
• Condensation
• How matter changes from one state to another

3) Reading every concept carefully and underlining the important topics, practicing in-text and end-of-exercise questions from the NCERT textbook

4) Students can also add flowcharts whenever required in a question, and this technique helps students to score extra marks and

5) Practice different types of questions to develop a proper understanding of the concepts provided in the textbook.

6) Identify your weaknesses in this chapter and work on them.

Topics and Subtopics Covered in the NCERT Textbook

8.1 Investigating Water's Disappearing Act

8.2 Another Mystery

8.3 What are the Different States of Water?

8.4 How can We Change the States of Water?

8.5 How can Water be Evaporated Faster or Slower?

8.6 Cooling Effect

8.7 How Do Clouds Give Us Rain?

NCERT Solutions for Class 6 Science

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NCERT Solutions for Class 6

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Also, check NCERT book and NCERT Syllabus here