Lesson plan for the surface tension experiment.
Video demonstration of the experiment.
Surface tension has to do with the intermolecular forces between atoms and molecules at the surface of a liquid. For example, when a drop of water is placed on a table, it doesn't just flow and spread in all directions, but instead forms a 'dome' shape, or nearly a hemisphere. The surface tension of water is strong enough to hold the drop in this shape, rather than forming a flat, spread out puddle of water. This experiment provides a way for students to compare different liquids against each other to determine which have stronger surface tensions than the other liquids. All one needs are different liquids that are available, and any method or piece of equipment that allows you to create individual drops of each liquid.
This experiment complies with Sierra Leone WASSCE 2016 standard:
Chemistry syllabus: Section A, Topic 7.0 STATES OF MATTER, Part c.i LIQUIDS
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