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What happens to the liquid water from wet clothes when they are left to dry in the sun?
Water exists in three dierent states: solid, liquid and gas.
Tap water and bottled water are water in the liquid state.
Liquid water can ow.
Ice and snow are water in the solid state. Solid water cannot ow.
Water vapour and steam are water in the gas state.
In higher classes, you will learn that water vapour and steam can also ow.
What I have learnt
Now let’s investigate the boiling of water.
Figure 15 shows boiling water. Observe Figure 15 carefully.
Discuss with your friends and write down what you observe.
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When liquid water boils, bubbles are seen rising in the water. The liquid water changes to
steam. Steam is also water in the gas state and is colourless.
Figure 15 - Boiling water
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