Place a balloon inside a cylindrical net (as is sometimes used to wrap garlic) and inflate it. The net will expand and shorten. Investigate the properties of such a “muscle”.

https://youtu.be/pBKBAaW3ydE

(包括但不限於以上影片,其他相關影片可參考 IYPT 2025 reference kit

Packaging-Net-Bag-for-Garlic.webp

參考資料:

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