🫧 Soap Bubbles

🟢 Ages 5–8
💡 Why round? Surface tension pulls the soap film into the shape with the smallest area — that's always a sphere!
Click anywhere to blow a bubble 🫧

🫧 Soap Bubbles — Surface Tension Magic

Blow soap bubbles and discover surface tension — the invisible force that makes water behave like a thin elastic skin. Why are bubbles always round? The answer is pure physics!

🔬 What It Demonstrates

Soap bubbles are spheres because a sphere has the minimum surface area for a given volume — and surface tension always pulls toward minimum energy. When two bubbles merge, they share a flat wall at the optimal angle.

🎮 How to Use

Click and drag to blow bubbles of different sizes. Watch them merge and form flat shared walls. Tap a bubble to pop it! Adjust the soap solution thickness to change bubble lifetime.

💡 Did You Know?

A soap bubble film is only 100–1000 nanometres thick (thinner than a human hair, which is 50,000 nm). Yet it creates all those beautiful colours — the same thin-film interference that makes oil puddles rainbow-coloured.