Class 6 Science

Chapter 8 Solutions — A Journey through States of Water

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Solutions

Overview

Step-by-step NCERT solutions for A Journey through States of Water (Chapter 8, NCERT Class 6 Science) — every question and answer worked out in full, not just the final result. You can also read the A Journey through States of Water textbook chapter.

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All 10 questions in A Journey through States of Water are solved in the PDF. Here's what's inside, exercise by exercise:

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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 gaseous state.
- (iii) The formation of clouds from tiny water droplets.
- (iv) The conversion of water vapour into its liquid state.
2.
Identify in which of the given processes, evaporation is very important—
- (i) Colouring with
- (a) crayons
- (b) water colours
- (c) acrylic colours
- (d) pencil colours
- (ii) Writing on paper with
- (a) pencil
- (b) ink pen
- (c) ball point pen
We see green coloured plastic grass at many places these days. Space around natural grass feels cooler than space around the plastic grass. Can you find out why?
Give examples of liquids other than water that evaporate.
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?
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 transportation cost of the sludge and enhances the safety of individuals handling it. Reflect upon it and explain how.
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?
How is water present in the solid state in nature?
Reflect on the statement "Water is our responsibility before it is our right." Share your thoughts.
The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?

Sample

Worked examples

3 questions from A Journey through States of Water, solved step by step.

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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 gaseous state. (iii) The formation of clouds from tiny water droplets. (iv) The conversion of water vapour into its liquid state.

Condensation is the process by which water vapour (gas) changes into liquid water.

Option (i) describes evaporation — water changing to vapour.

Option (ii) also describes evaporation — liquid changing to gas.

Option (iii) describes cloud formation, which is a result of condensation but not its definition.

Option (iv) correctly states: the conversion of water vapour into its liquid state — this is condensation.

Answer: (iv) The conversion of water vapour into its liquid state.

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We see green coloured plastic grass at many places these days. Space around natural grass feels cooler than space around the plastic grass. Can you find out why?

Natural grass contains water. Water evaporates continuously from the surface of natural grass leaves.

Evaporation requires heat energy, which it takes from the surroundings. This removal of heat cools the air around natural grass.

Plastic grass has no water and does not evaporate anything. No heat is absorbed from the surroundings, so the area around plastic grass does not get cooled.

Therefore, the space around natural grass feels cooler than the space around plastic grass.

Answer: Natural grass evaporates water continuously, absorbing heat from surroundings and causing a cooling effect. Plastic grass cannot evaporate, so no cooling occurs around it.

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Give examples of liquids other than water that evaporate.

Many liquids evaporate, just like water.

Examples of liquids that evaporate:

1. Hand sanitiser — disappears quickly when rubbed on hands (as mentioned in the chapter).

2. Petrol — evaporates rapidly; you can smell it near a petrol pump.

3. Alcohol / spirit — evaporates fast; used to clean wounds.

4. Nail polish remover (acetone) — evaporates quickly with a strong smell.

5. Perfume / cologne — evaporates from skin, releasing fragrance.

Answer: Hand sanitiser, petrol, alcohol, nail polish remover, perfume — these are liquids other than water that evaporate.

All 10 questions in A Journey through States of Water are solved step by step in the Solutions PDF above.

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Chapter 8 Solutions — A Journey through States of Water

Overview

What these solutions cover

Let Us Enhance Our Learning

Worked examples

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 gaseous state. (iii) The formation of clouds from tiny water droplets. (iv) The conversion of water vapour into its liquid state.

We see green coloured plastic grass at many places these days. Space around natural grass feels cooler than space around the plastic grass. Can you find out why?

Give examples of liquids other than water that evaporate.

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