Soap Experiment

A quick and easy soap experiment that demonstrates how soap reduces surface tension.








Surface Tension

Explain to your children that there are forces of attraction between the molecules of a liquid .

Products like soaps and detergents weaken or break these forces of attraction and help other substances to mix with them more easily. This helps us with cleaning and washing things like dishes, clothing and our bodies.

Soap Washing Experiment

You will need

cooking oil
water
dishwashing liquid


Method

Place a few drops of cooking oil on your hand and rub it on the palms of your hand.
Rinse you hands under water and see if the oil is removed.
Now add a drop of dishwashing liquid, rub it on your palms and then rinse again.

Result

The dishwashing liquid enables the oil to mix with the water and to be removed from your skin more easily.





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