Return to Home Page
		Previous Page
Cartesian Divers
To make a diver you will need:
	a 2-L bottle with a cap
	a nut
	a plastic pipet
	a hot glue gun and a glue stick
	scissors
	water
Directions:
	Cut the pipet approximately 1 cm below the bulb.
	Hot glue the nut onto the opening of the pipet.
	Carefully dip the pipet with nut into water. Squeeze out some of the air and let water into the bulb. Leave some air in the bulb so that it still floats.
	Fill the 2 liter bottle with water.
	Place the Cartesian diver (the pipet bulb/nut) into the bottle.
	Screw the cap onto the bottle.
	Gently squeeze the bottle. The diver should descend when the bottle is squeezed. And should return to the top of the bottle when the pressure is released. Make adjustments to the amount of water in the diver if this does not occur.
Enhancements - Try these ideas
	Make 2 or 3 divers and place them into the same bottle. Adjust the divers so they descend at different times.
	Add a hook to the bottom of a diver. Make another diver with a loop on the top. Fill the diver with the loop on top so that it will sit on the bottom of the bottle. Try squeezing the bottle and catch the bottom diver’s loop with the top diver’s hook.
Bonus - 3 points for a diver, 6 points for a diver and explanation
	Bring a completed diver into Mrs. Spang. Make sure you can use the concept of density to explain how the diver works.
Previous Page
Return to Home Page