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Investigating Water Surface Tension

Investigating Water Surface Tension | Science Fair Projects | STEM Projects
We'll investigate how the surface tension of water changes when salt is added and the temperature is increased. We'll measure the weight of rice grains needed to sink a piece of aluminum foil in the water.


The hypothesis is that when salt is added to water and the temperature of the water increased, the surface tension of water is reduced.

Method & Materials

You will measure the weight of rice grains needed to sink a piece of aluminum foil in the water at different temperatures and with and without salt.
You will need two beakers, 400ml of distilled water, a measurement cylinder, two tablespoons of salt, a cup of rice grains, two pieces of aluminum foil measuring 1cm x 1cm each, a refrigerator, a hot plate, a thermometer, and a hot plate.


The results showed that when salt was added to the water and the temperature increased, the number of rice grains required to sink the aluminum foil decreased. This suggests that the hypothesis is correct.

Why do this project?

This science project is interesting because it demonstrates how surface tension works and how it can be affected by different factors.

Also Consider

Variations of this experiment could include using other liquids such as oil or alcohol, or adding other substances like sugar or milk into the water.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

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