The Tubeless Siphon

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In this classic demonstration, from the Royal Society of Chemistry, a viscous liquid of polyethylene oxide in propan-2-ol (isopropanol) is poured into a second beaker. On returning the first beaker to the upright position, the liquid continues to siphon by climbing up the side of the beaker and over the rim.

The resource provides a list of apparatus and chemicals needed for the experiment, together with teaching tips.

Curriculum links include: viscosity, hydrogen bonding.

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