Why Are Bubbles Colourful? #science #sciencedemo #bubbles #experiment #funscience #physics #learning

Why It Matters

Understanding thin-film interference explains a common visual phenomenon and illustrates basic optics principles useful in physics education and real-world applications like coatings and sensors.

Summary

The video explains why soap bubbles display colorful patterns by demonstrating interference with a projector and bubble wand. A bubble’s film is a three-layer “sandwich” of soap, water, and soap; light reflects from both the front and back surfaces, producing interference that emphasizes different wavelengths. Gravity causes the liquid film to flow and vary in thickness—thinner at the top and thicker at the bottom—so different colors appear where the film thickness changes. The presenter links the effect to the same rainbow patterns seen in oil on puddles.

Original Description

Those colourful swirls on a soap bubble are caused light interfering with itself inside a tiny “soap sandwich.” 🌈

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