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Inside a Soap Bubble
Age 11 · Physics
A soap bubble is a pocket of air wrapped in a very thin film. The film is mostly water, held together by soap molecules.
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Age 11: open this week
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In the picture
- Hollow air inside the bubble: the air pocket trapped by the film
- Thin water layer: the watery part of the bubble film
- Soap molecule row: round heads in the water and wavy tails in the air
Examples
- Blowing bubbles with a wand
- Foam on dish soap
Key takeaways
- The bubble film has water in the middle and soap molecules on both sides.
- The air inside is separated from the outside air by the thin film.
Quiz: Inside a Soap Bubble (Age 11)
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What is inside the hollow part of a soap bubble?
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Where are the soap molecules in the bubble film?
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What separates the air inside a soap bubble from the air outside?
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