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Surface tension of waterFeatured science projectScience project video

Observation

It is observed that when salt is added to water and the water temperature increased, the number of rice grains required to sink the aluminum foil reduces.
 

Water solution Number of grains of rice to sink 1cm x 1cm of aluminum foil
  15°C 25°C 35°C 45°C 55°C
Water 19 16 14 11 9
Water and salt 7 6 5 5 4

The graph below represents the results of our science project.
 

Surface tension science fair project

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Complexity level:
5
Project cost ($):
10
Time required:
1 hour to prepare, 4 hours for observation
Material availability:
Easily found
Safety concerns:

None