Class 6 Science: seeing evaporation and condensation at home

Two things a Class 6 child might say: "The puddle just went away," and "The glass is leaking." Both are honest guesses, and both are wrong in an interesting way. The chapter "A Journey through States of Water" gives them better ideas to swap in. Everything below uses cold water, ice, plates and cloth. An adult should stay nearby, and nothing needs heat, flames or hot water.

First, the vocabulary (it's short)

• One substance, three states. Ice is solid water, the water we drink is liquid, and water vapour is a gas. It's the same stuff each time.
• Evaporation is liquid water turning into water vapour. It happens even at room temperature.
• Condensation is water vapour turning back into liquid when it touches something cold.
• The water cycle is what happens when you put those together: water evaporates, forms clouds, falls as rain, flows to rivers and oceans, and starts over.

One more thing worth knowing before the experiments. Water evaporates faster when it's spread out, when it's warm and when air is moving. It's slower when the air is already damp.

Experiment 1: where did the water go?

Put one spoon of water on a steel plate. On a piece of paper beside it, mark the edge of the drop with a pencil dot. Check after a few minutes. The plate underneath is dry, so the water didn't soak in anywhere. Ask your child the only question that matters here: where could it have gone?

Experiment 2: spread out or bunched up?

Pour the same amount of water into a small cup and onto a wide plate. Which one dries first? Then hang two identical wet cloths, one folded and one spread open, and let your child predict which will dry first before they check.

Say out loud what you changed and what you kept the same. That habit is called a fair test, and it's the closest thing to a superpower in science class.

Experiment 3: sun or shade?

Put a spoon of water on one plate in the sun and one in shade. What was different between the two? Then ask a practical one: how could you dry a wet cloth faster on a rainy day? Expect some creative answers.

Experiment 4: who is leaking?

Fill a steel glass with ice-cold water and stick a strip of tape at the water level. After some minutes, drops appear on the outside, but the level hasn't dropped. So the glass didn't leak. The drops came from vapour in the air touching the cold surface. For comparison, set out a glass of room-temperature water, which should stay dry.

This is the one a child tends to repeat to the next person who says the glass is leaking.

Three questions, no book

Ask these in the kitchen, without the book:

1. Why do clothes dry faster on a hot, windy day than on a damp, rainy one?
2. Drops formed on the outside of a cold glass. Where did that water come from?
3. Ice, water and vapour: what's the same about them, and what's different?

If your child answers in their own words, they're in good shape. If one question stumbles, that's the idea to repeat next weekend.

The chapter in five small ideas

The chapter is split into five ideas, each with a short explanation, a "why it matters" line and a two-minute activity. You can see them here: A Journey through States of Water, Class 6 Science. The page also lists the quizzes and games that go with each idea.

After the experiments, a quiz

KRIGYAN has short quizzes and games for Class 6 Science chapters like this one, and the parent view shows which ideas look strong and which need another go, with a tip for home. There are no ads, no chat with strangers and no open chat with an AI. It's free to try right now. If you send us your child's class and chapter, we'll tell you straight whether it's covered.