• Student test on surface tension

• Teacher notes and answers for this test

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Parent and Teacher Notes

This experiment helps explain surface tension to your child by showing how it helps objects like leaves float on water. We can even create enough surface tension by poking holes in paper to keep water from spilling out of an upside-down cup!

Scientific concepts covered:

Surface tension: Liquids have surface tension because they are made up of tiny particles which are attracted to each other, and these particles form a ‘skin’-like layer on the liquid’s surface. This allows the liquid to hold up a weight and is the reason why things like leaves can float on the surface of water.

Pressure: Pressure is the force that’s applied on a specific area. If a lot of molecules are hitting or applying force, a high-pressure area is formed. Where there are less molecules applying force, a low-pressure area occurs.

Hydrogen bonds: Hydrogen bonds occur between two water molecules and pulls them together. It is the attraction between one water molecule’s hydrogen atom, and another nearby water molecule’s oxygen atom.

Production Notes

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