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Why Don't Sharks Sink?

Updated: Jul 23, 2020

Easy and fun science experiment for kids

Did you know that if a great white sharks can weigh more than 2000 pounds! They are heavy and large! So why don't they sink? Well, one of the reasons that we tackle with this experiment is because of their large oily liver. Their livers take up about 30% of their mass. Oil is less dense than water which gives sharks a neutral buoyancy. However, if they stop swimming...they may just sink.

Source: We found this information from and from The Smithsonian mag.


  • Balloons or plastic water bottles

  • Water basin

  • Black marker

  • Oil

  • Water


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