Chapter 7 · CBSE Class 5 EVS (NCERT Looking Around)

Experiments with Water

Explore the three forms water can take, and the simple experiments that show how it changes from one to another.

💧 Chapter 7

7.1

The Three States of Water

Water can exist as a solid (ice), a liquid (the water we drink), or a gas (water vapour, which is invisible and present in the air around us).

1

What is the solid form of water called?

Ice

2

What is the gas form of water called?

Water vapour

7.2

Changing Between States

When water is heated enough, it boils and turns into vapour — this is called evaporation. When water is cooled enough, it freezes into ice. Water boils at 100°C and freezes at 0°C at normal conditions.

1

At what temperature does water freeze into ice?

0°C

2

What is it called when water turns into vapour on heating?

Evaporation

Why it matters — This is exactly what happens in the water cycle — the Sun evaporates water from oceans and rivers into vapour, which later cools, condenses into clouds, and falls back down as rain.
Practice

Exercises

1. Name the three states water can take.

2. At what temperature does water boil?

3. What do we call it when water changes from liquid to vapour?

4. What happens to water when it is cooled to 0°C?

5. Why do wet clothes dry faster on a hot, sunny day than on a cold, cloudy one?

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