Enjoying Our Journey

Living, Loving and Learning Together

Cephalopods and Buoyancy

on March 16, 2013

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This is an experiment that the kids did earlier in the year. First, they decorated a medicine dropper to look like a cephalopod.

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Then, they added just enough water to the dropper to make it float.

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Next, they put the dropper into a bottle of water and closed the lid. They observed what the “cephalopod” did when the bottle was squeezed and released. They discovered that squeezing the bottle allowed more water to enter the dropper which made it sink. Releasing the pressure on the bottle sent water out of the dropper making it lighter so it rose. This is similar to how some cephalopods can control their buoyancy by taking in or expelling water.

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