Track quiz
Seven quick questions. Use the table if you get stuck.
| Idea | The rule |
|---|---|
| Three forms, one water | Freezes at 0 °C, boils at 100 °C. Vapour is invisible. |
| Evaporation | Liquid to vapour at almost any temperature. Faster with surface, warmth and wind. |
| Condensation | Vapour to liquid on a cold surface. Drops come from the air. |
| Melting and freezing | Opposite changes. Water is never used up. |
| The water cycle | Evaporation, condensation, rain, flowing back. The Sun drives it. |
| Cooling by evaporation | Evaporating water takes warmth away. |
What is the white cloud above hot tea made of?
Water is cooled to −5 °C. What is it now?
Which shirt dries first?
A cold steel glass gets wet outside. Where did the water come from?
Vapour turns into drops on a cool lid. What is this called?
Water falls as rain. What happens to it next?
Why does a wet clay matka keep water cool?
Read Chapter 8 in your NCERT book. Next: Methods of Separation in Everyday Life. You will learn six ways to pull a mixture apart.