Soap Bubble on a Loop Finds Minimum Shape
Films stretch into smooth minimal surfaces.
Teaching & key ideas
What you do: Dip different loops and compare films.
What students see: Films stretch into smooth minimal surfaces.
Why it works: Surface tension pulls the film toward the least-area configuration.
Question to ask: Why are the films smooth instead of wrinkled?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why are the films smooth instead of wrinkled?