Diving Cartesian Octopus

Watch the floating octopus dive to the bottom when the bottle is squeezed.
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The Diving Octopus is a twist on the Cartesian Diver science classic. The octopus floats in a bottle filled with water, then when the bottle is squeezed the octopus mysteriously takes a plunge to the bottom. Release the squeeze and up the octopus ascends to the top again. This kit also includes a fun activity where the aim is to hook a sunken weight and bring it to the surface.

Age: 5+

What You Get

A plastic bulb (Diving Octopus) with nuts and wire attached, 3 weights. Instructions. You need to supply a 2 liter plastic bottle as the diving tank.

How does it work

Buoyancy is the tendency of an object to float in a fluid. An object floats if it's lighter (or less dense) than the fluid, and will sink if it is more dense. The density of the Diving Octopus is made up of the plastic pipette bulb, nut, air pocket and water inside the bulb. When the bottle is squeezed, compressing the air inside the dropper and allowing more water to enter the bottle causing it to sink. When the bottle is released, the pressure drops again. The air in the dropper expands, pushing water out. This makes the diving Octopus lighter, so it floats to the surface.


  • Floating, sinking and buoyancy
  • Relationship between air pressure and density
  • Difference in the properties of air and water

WARNING: CHOKING HAZARD Small Parts. Not for children under 3 years.

More Information
Length (cm) 8
Width (cm) 4
Height (cm) 12
Age Group 5-6 Years, 7-8 Years, 9-10 Years
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