Water Tumbler
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Mark II Rock Tumbler _ Water Cooler Jug _ Part 1
Water Tumbler

Why the cotton wool does not get wet?
A piece of cotton wool is wedged at the bottom of an empty tumbler. The tumbler is then turned upside down and pushed below the surface of the water in a deep bucket. The cotton wool does not get wet. Why?
There is an air bubble trapped inside the tumbler which keeps water away from the cotton wool
Comped321 - Alkaline Water Tumbler
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US $795.00




















































































