Uploaded June 2022 | Updated September 2026, 2 weeks ago

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Getting this to work consistently has been an issue for me for 50 years but I think I am cracking it!!! The grated cork is "green" and works well for students. The eco glitter is good for a demonstration under a visualiser. Calcualtion is tricky. It is an importnt experiment as it begins to show that weare having to cope with particles invisible to the eye.