This MCQ module is based on: The Three States of Water
TOPIC 27 OF 46
The Three States of Water
🎓 Class 6
Science
CBSE
Theory
Ch 8 — A Journey through States of Water
⏱ ~14 min
🌐 Language: [gtranslate]
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A Cool Drink on a Hot Day — Aavi & Thirav Wonder
It was a scorching afternoon. Aavi and her little brother Thirav were sipping a tall glass of shikanji — fresh lemonade with cubes of ice clinking inside. Thirav stared at the floating ice and asked, "Didi, is this ice a different thing from the water? It looks like a stone, but water is like a liquid rain!"
Aavi smiled and stirred her drink. "They look different, but they are the same substance, Thirav. Ice is just water in a solid form. When it warms up, it melts back into the water you drink. And if we boil water, it rises up as steam — that is water again, only as a gas!"
"Mazhai peydhaal nadhi perugum, nadhi perugum kadal niraindhidum…"
(When rain falls, rivers swell; when rivers swell, the oceans fill.) — A Tamil verse reminding us how water keeps travelling.
(When rain falls, rivers swell; when rivers swell, the oceans fill.) — A Tamil verse reminding us how water keeps travelling.
8.1 The Three States of Water
Water is one of the most amazing things around us because we see it in three different forms in everyday life. These forms are called the three states of matter: solid, liquid, and gas.
Solid — Ice
Has a fixed shape and a fixed volume. You can hold an ice cube; it keeps its cube shape.
Liquid — Water
Has a fixed volume but no fixed shape. It takes the shape of the glass, bottle or bowl it sits in.
Gas — Water Vapour
No fixed shape, no fixed volume. It spreads out everywhere and fills all the space available.
Water vapour is the gas form of water. It is invisible! The white cloud you see above a boiling pot is actually tiny water droplets (mist), not the gas itself.
Activity 8.1 — Observe Ice, Water, and Steam L3 Apply
You need: an ice cube on a plate, a glass of water, a cup of warm water with steam rising.
- Look at the ice cube. Can you hold it? What is its shape?
- Pour the water from the glass into a bowl. Did it keep its old shape?
- Hold your hand (safely!) above the warm cup. What do you feel rising?
- List what is same about all three, and what is different.
Predict: Which one will fill a whole room if left open?
Same: all three are made of water — the same substance. Different: ice stays as a cube; water flows and takes the bowl's shape; steam rises and spreads everywhere. The gas (water vapour) will fill the whole room because it has no fixed shape or volume.
8.2 What Are Particles Doing? — A Simple Look Inside
Everything around us — ice, water, steam, even chairs and air — is made of very tiny pieces called particles. These particles are too small to see with our eyes, but they help us understand why solids, liquids and gases behave differently.
How the Particles Are Arranged
- Solid (ice): particles are packed very close to each other and sit in a neat, regular pattern, like students standing in a line. They only vibrate in place — that is why ice keeps its shape.
- Liquid (water): particles are still close together, but they can slide past each other. That is why water can flow and take any shape.
- Gas (water vapour): particles are very far apart and move fast in every direction. They do not touch much — so a gas spreads out and fills any container.
Remember: the particles themselves do not change — the water particle in ice, in liquid water, and in steam is the same. Only the way they are arranged changes.
8.3 Other Substances Also Have Three States
Water is a good example, but it is not alone. Almost every substance on Earth can exist in all three states — we just need to make it hot enough or cold enough.
Take iron, for example. At room temperature, iron is a hard solid (a nail, a gate). In a huge furnace at very high temperature, iron melts into a glowing orange liquid — this is molten iron, used to make steel. If heated even further, iron can become a vapour (gas). So even something as hard as iron has three states!
| Substance | Solid | Liquid | Gas |
|---|---|---|---|
| Water | Ice | Water | Water vapour / steam |
| Iron | Iron nail, bar | Molten iron (very hot) | Iron vapour |
| Wax (candle) | Wax stick | Melted wax | Wax vapour |
| Butter | Cold butter | Melted butter | — (breaks down first) |
Interactive: Match the State L2
Look at each picture below. Tap the correct state — Solid, Liquid, or Gas.
Q1. A snowflake falling on your palm in the hills.
Q2. Mist rising from a cup of hot tea.
Q3. Water flowing from a tap into a bucket.
Competency-Based Questions
Aavi fills an empty glass bottle with water from the tap. She puts the bottle in the freezer overnight. The next morning she finds the water has turned to ice, and the ice has cracked the bottle slightly at the top. Meanwhile, she boils a kettle and watches steam come out — the steam quickly disappears into the kitchen air.
Q1. What are the three states of water? Give one everyday example of each. L1
The three states are solid (example: ice cube, snow), liquid (example: drinking water, rainwater), and gas (example: steam rising from hot tea, water vapour in air).
Q2. Which of these statements about a gas is correct? L2
Answer: C. A gas has neither a fixed shape nor a fixed volume — it spreads out to fill whatever container or space it has.
Q3. Why can water take the shape of a bottle, but ice cannot? L2
In liquid water, the tiny particles can slide past each other, so water flows and takes the container's shape. In ice, the particles are locked in a regular pattern and can only vibrate in place, so ice keeps its own shape and does not flow.
Q4. In Aavi's freezer, the water turned to ice and cracked the bottle. What does this tell us about the space occupied by ice compared to water? L4
Ice takes up more space than the same amount of water. When water freezes, its particles settle into a regular pattern with tiny gaps — the overall volume grows. This extra space pushed against the bottle and cracked it.
Q5. Steam from Aavi's kettle "disappeared" into the kitchen air. Did it really vanish? Explain. L4
No, the steam did not vanish. It simply turned into water vapour, which is the invisible gas form of water. Its tiny particles mixed with the air of the kitchen, so we could not see them anymore. The water is still there — just spread out as a gas.
Assertion – Reason
Assertion (A): Ice, water, and water vapour are all the same substance.
Reason (R): They are made of the same kind of tiny particles, only arranged differently.
Answer: A. Both are correct, and the reason gives the exact explanation — the particles are the same; only the arrangement changes.
Assertion (A): A gas has no fixed shape but has a fixed volume.
Reason (R): Gas particles stay packed close together like in a solid.
Answer: D... no, let us check. A is false (a gas has no fixed volume either) and R is also false (gas particles are far apart, not close). So neither statement is correct — the closest standard option is that both A and R are false. If your paper uses only A–D as given, the answer is D is not right either; both are wrong.
Assertion (A): Iron is always a solid and can never be a liquid.
Reason (R): Iron melts only at very high temperatures inside a furnace.
Answer: D. Iron can become a liquid (molten iron) when heated a lot, so A is false. The reason R is a true fact about iron's melting.
Next → Part 2: Melting, Freezing, Evaporation & Condensation
Frequently Asked Questions — The Three States of Water
What does the topic 'The Three States of Water' cover in Class 6 Science?
The topic 'The Three States of Water' is part of NCERT Class 6 Science Chapter 8 — A Journey through States of Water. It covers the key ideas of states of water, solid, liquid, gas, ice, water vapour, properties, explained through everyday examples, labelled diagrams and hands-on activities from the NCERT Curiosity textbook. Class 6 students learn simple definitions, see why each idea matters in daily life, and try short experiments and observations. The lesson uses easy language, colourful pictures and small questions so that young learners build a strong base for higher classes and for competency-based questions in CBSE school tests.
Why is 'The Three States of Water' important for Class 6 NCERT Science?
'The Three States of Water' is important because it builds the first ideas of science that Class 6 students will use again in Class 7, 8 and beyond. NCERT Chapter 8 — A Journey through States of Water — introduces states of water and connects it to things children already see at home, at school and in nature. Learning this topic helps students ask better questions, understand simple news about science, and score well in CBSE tests that use competency-based questions. The chapter also supports NEP 2020 by encouraging curiosity, observation and learning by doing rather than only reading and memorising.
What are the key ideas students should remember from The Three States of Water?
The key ideas in 'The Three States of Water' for Class 6 Science are: states of water, solid, liquid, gas, ice, water vapour, properties. Students should be able to say each term in their own words, give one or two easy examples from daily life, and draw a small labelled diagram where needed. A good way to revise is to make flashcards, write a short note in the science notebook, and solve the NCERT in-text and exercise questions of Chapter 8. Linking every idea to something seen at home or school — in the kitchen, garden, playground or sky — makes these ideas easy to remember for unit tests and the annual CBSE examination.
How is The Three States of Water taught using activities in NCERT Curiosity Class 6?
NCERT Curiosity Class 6 Science teaches 'The Three States of Water' through an inquiry-based approach using Predict–Observe–Explain activities. Students first make a guess, then try a small experiment with safe, easily available materials, and finally explain what happened and why. This matches the NEP 2020 focus on learning by doing. For Chapter 8 — A Journey through States of Water — the textbook has hands-on tasks, labelled pictures and thinking questions built for Bloom's Taxonomy Levels 1 to 6. Teachers use these activities, along with competency-based questions (CBQs) and assertion–reason items, to check real understanding instead of only rote learning.
What real-life examples of states of water can Class 6 students see at home?
Class 6 students can see states of water at home in many simple ways linked to 'The Three States of Water'. Kitchens, school bags, playgrounds, the garden and the night sky are full of examples that match NCERT Chapter 8 — A Journey through States of Water. For example, students can look at food labels, watch changes while cooking, try safe activities with water, magnets or shadows, and observe the Sun, Moon and weather each day. Keeping a small science diary — with the date, what was observed and a quick drawing — turns daily life into a mini science lab. These real-life links make concepts easy to remember and help in answering competency-based questions in CBSE Class 6 Science.
How does 'The Three States of Water' connect to other chapters of Class 6 Science?
'The Three States of Water' connects to many other chapters in NCERT Class 6 Science Curiosity. The ideas of states of water come back when students study related topics like diversity in the living world, food, magnets, measurement, materials, temperature, water, separation, habitats, natural resources and the solar system. For example, what students learn here helps them build mental pictures for later chapters and for Class 7 and Class 8 Science. Teachers often ask cross-chapter questions in CBSE exams to check if students can use what they learned in Chapter 8 — A Journey through States of Water — in new situations. This linked approach matches the NEP 2020 and NCF 2023 focus on holistic, competency-based learning.
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