E ExamMaster

CBSE Class 6 · Science

A Journey through States of Water

Official NCERT chapter from Curiosity (book code fecu1). ExamMaster notes are original teaching at CBSE Class 6 depth.

This lesson follows the official chapter “A Journey through States of Water” in Curiosity. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 6
  • Easy level
  • 8 concepts

1Investigating Water’s Disappearing Act

A wet plate dries. The water did not vanish from the world — it went into the air as vapour you cannot see. Disappearing here is a change of state, not a magic delete.

“It was stolen” without a test is a story.

Figure. An open dish loses water as vapor. A lid keeps the same water in the bowl. It did not vanish.

How it works

  1. See a wet surface become dryThe act.
  2. Ask where the water wentInto the air as vapour.
  3. Refuse delete-from-the-universeIt changed state.

2Another Mystery

A cold glass “sweats”. That water did not leak from inside if the glass is closed — it came from vapour in the air that turned liquid on the cold surface. Mystery means a second change of state you can name.

Wiping the sweat and calling it a leak from the drink is a miss if the glass did not drip from a crack.

Figure. The “missing” water hit a cold lid and came back as drops. That is the same water, condensed.

How it works

  1. See drops on a cold closed glassThe mystery.
  2. Name the source as air-vapour cooling to liquidCondensation.
  3. Keep it separate from a cracked leakTwo different jobs.

3What are the different States of Water?

Ice is solid water. The drink is liquid water. Steam and unseen vapour are gas. Three states, one substance if you can argue the same water moved.

Oil is not a state of water.

Figure. Ice, water, and steam are three packings of the same water. Packed, sliding, or flying apart.

How it works

  1. Point to a solid sampleIce cube.
  2. Point to a liquid sampleThis glass.
  3. Name gas as steam you can see, or vapour you were told aboutThe third state.

4How can we change the States of Water?

Heat can melt ice and boil water. Cool can freeze water and condense steam. The change needs a reason you can name: heat added or taken, or pressure in a later class — here, stay with heat and cool you can arrange.

Wishing ice into steam without a heat-story is a cartoon.

Figure. Heat melts and boils. Cool freezes and condenses. The arrows reverse; the substance does not.

How it works

  1. Name the start stateIce, or liquid.
  2. Name heat added or takenThe reason.
  3. Name the new stateThe change.

5How can Water be Evaporated Faster or Slower?

Evaporation speeds up with more heat, more wind, and more open surface. A wide plate dries faster than a narrow bottle of the same water. A lid slows it.

Stirring a slogan without changing heat, wind, or surface is not a speed-test.

Figure. Heat, wind, and a wider surface empty a dish faster. One change at a time is a fair test.

How it works

  1. Pick one changeWarmer place, breeze, or wider dish.
  2. Keep the amount fair if you canSame water, one change.
  3. See which dries soonerFaster evaporation.

Wide versus narrow

Equal water in a wide plate and a narrow glass sit in the same room. Which should dry first, and why?

  • Same roomsame heat, same air
  • Differenceopen surface
  • Fasterthe wide plate

Pro tip. More surface in contact with air — faster evaporation, other things fair.

6Cooling Effect

When water evaporates from skin or a wet cloth, it takes heat from that surface. The surface feels cooler. That is the cooling effect — not a new kind of ice.

A dry cloth in the same wind does not cool the same way.

Figure. A wet cloth cools because leaving vapor takes heat with it. Dry cloth has no such exit.

How it works

  1. Wet a safe surfaceSkin-safe, or a cloth.
  2. Let air move if you canEvaporation.
  3. Notice coolerHeat left with the vapour.

7How do Clouds give us Rain?

Cloud drops can join and grow until they fall. Rain is liquid water arriving from those drops. This class names the idea; it does not demand a weather-station proof from one window.

Every white patch in the sky is not automatically rain in the next minute.

Figure. Water rises as vapor, gathers as cloud, falls as rain, and is water again. One substance on a loop.

How it works

  1. Name cloud as tiny water or ice bits in airA collection.
  2. Name growing and falling as rain (or other fall)The give.
  3. Keep one look as one caseNot a forecast license.

8Ice, water, and steam are one substance in three states

Melt the ice, you still have water. Boil it, you still have the same substance as steam. Three costumes, one substance-word at this class.

Steam from a kettle is not a new chemical you invented.

Figure. Ice, liquid, and steam are one substance in three states. The name on every box is the same water.

How it works

  1. Start with iceSolid water.
  2. Melt, then heat further if you can name the next stateLiquid, then gas.
  3. Keep the substance-word waterStates change; the name stays.
Sweat on a cold closed glass is usually
  1. Vapour from air becoming liquid on the cold surface
  2. A leak from a sealed drink
  3. Ice mining

Condensation, not a crack.

Notes

  • Mapped to the official NCERT chapter “A Journey through States of Water”. Original teaching only — no textbook sentences.
  • Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.

Recap

Hold these pegs from the official chapter “A Journey through States of Water”. The wording is ExamMaster’s teaching, not a textbook recap.

Investigating Water’s Disappearing Act
A wet plate dries. The water did not vanish from the world — it went into the air as vapour you cannot see. Disappearing here is a change of state, not a magic delete.
Another Mystery
A cold glass “sweats”. That water did not leak from inside if the glass is closed — it came from vapour in the air that turned liquid on the cold surface. Mystery means a second change of state you can name.
What are the different States of Water?
Ice is solid water. The drink is liquid water. Steam and unseen vapour are gas. Three states, one substance if you can argue the same water moved.
How can we change the States of Water?
Heat can melt ice and boil water. Cool can freeze water and condense steam. The change needs a reason you can name: heat added or taken, or pressure in a later class — here, stay with heat and cool you can arrange.
How can Water be Evaporated Faster or Slower?
Evaporation speeds up with more heat, more wind, and more open surface.
Cooling Effect
When water evaporates from skin or a wet cloth, it takes heat from that surface.

Practise A Journey through States of Water

Reading is free and needs no account. Practice, mocks and progress live in the app.

  • A 4-question practice set that ends the chapter
  • 1 quick check with worked explanations
  • Timed mocks scored with the real marking scheme
  • Readiness tracked per topic, kept on your device
Continue with Google — freeNo card, no trial. Works offline once installed.