What Makes Ice Melt Fastest?
Three ice cubes, three different places. Predict which melts first — then catch the answer with your own eyes.
⏱️ Micro Plan — 4 short parts · about 20 min in total
- 1The Question5 min
- 2Predict5 min
- 3Experiment & Discover5 min
- 4Reflect5 min
🎯 Learning objectives
After completing this lesson, the child should be able to:
- Set up a fair test with three conditions
- Discover that heat melts ice fastest
- Understand why salt helps ice melt
❓ Question
What makes ice melt fastest?
👀 Observation
Where have you seen ice melt before? In a cold drink it lasts a while. On a warm bench it turns to water quickly. What is different about those two places? Heat!
🔮 Prediction
Three ice cubes: one on a plate, one in a cup of cold water, one in a cup of warm water. Which melts first? Second? Last? Write your prediction in order — 1, 2, 3.
🧪 Exploration
Set up the three ice cubes at the same time and start a timer. Check every two minutes. Try a bonus test: sprinkle a little salt on a fourth ice cube — what happens?
🔍 Discovery
The warm-water cube melts fastest, the cold-water one second, and the plate cube slowest of all. And the salted cube? It gets little craters and melts surprisingly fast!
💡 Explanation
Ice melts when it gets heat. Warm water carries heat into the ice fastest. And salt is sneaky: it makes it harder for water to stay frozen, so ice with salt on it melts even below the usual melting point. That is why people sprinkle salt on icy roads!
✏️ Practice
Predict: on a hot day, where would an ice cube last longest — a metal pan, a towel, or a foam cup? Guess, test, then try the Prediction Quiz.
🪞 Reflection
Did the order match your prediction? What else could you test — does juice melt the same as water? Does an ice cube with a coin on top melt differently? Your next experiment is waiting!
🧪 Materials for this experiment
4 ice cubes · a plate · two cups (cold and warm water) · a little salt · a timer · your prediction written down first