This Cartesian diver game is guaranteed to get anyone hooked on science! The soda bottle houses two divers: a hook and a sinker. The hook diver has a wire attached that is bent in the shape of a hook just big enough to latch onto the loop of wire extending over the top of the sinker diver. The sinker rests at the bottom of the bottle while the hook diver floats. The object of the game is to make the hook diver sink by squeezing the soda bottle and to hook the sinker on the bottom. It's a game of science and skill and lots of fun frustration! Recommended for children ages 6 and up.

What's included?

• Materials to build 30 Hook Cartesian diver games and instructions

You supply the plastic soda bottles and caps.

How does it work?

The 2-liter soda bottle provides a diving "tank" for two divers: a "hook" and a "sinker." The purpose of this science game is to get the hook diver to catch the sinker diver by squeezing the soda bottle. The pressure you apply to the sides of the bottle changes the density of the hook diver and allows it to float and sink on command.

What does it teach?

Learn about the difference in the properties of air and water. Discover the relationship between air pressure and density, and how to make a floating diver more or less buoyant. Float or sink? It's your choice!

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