Science · Stage 4
Changes of State
Heat it and cool it! Watch solid ice turn to liquid water and then to steam — and back again.
✦ Science📘 Stage 4 · S4⏱ ~10 min🧒 Ages 8–9★ Free to start
investigate melting, freezing, boiling, evaporation and condensation.
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Kavi's Melting Ice Cube
Kavi holds a cold ice cube 🧊 in one wing. "Ooh, it's melting into water 💧! If I heat water it bubbles into steam ☁️, and if I cool water it freezes back to ice. The same water can be a solid, a liquid or a gas — all it takes is heating and cooling. Let's investigate!"
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What your child will learn
1The three states of matterThe same stuff can be in three states. Tap each one to see how it behaves.
2Heating or cooling?Some state changes happen when stuff gets warmer. Others happen when stuff gets cooler. Tap the right box!
3What will it become?Use what you know about heating and cooling to predict. Then tap to check! Tap Next test for more.
4Heat it, then cool itWatch the same water change state as you heat and then cool it. Tap each step.
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A peek inside
Kavi leaves an ice cream 🍦 out in the hot sun. What happens to the solid ice cream, and what is this change called?
The sun heats the solid ice cream, so it turns into a liquid. Solid turning to liquid by heating is called melting.
Try this at home: What change happens when you heat solid ice?
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Science · Stage 4 · S4 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.