Fill 6 or more 2 litre plastic bottles with water. Have students form groups of 2 or 3.
Students need to use large container filled with water to float glass medicine dropper.
Have them adjust amount of water so that dropper just floats. In dropper shown 1 ml. of water works well.
Place the dropper in the bottle , tightly close lid and squeese the bottle with two hands. The pressure contracts the water in the dropper allowing more water to enter the dropper.
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Thanks for a great post. My students love cartesian divers! Have you ever tried making them with ketchup packets? (http://www.stevespanglerscience.com/experiment/00000090) It is a fast and easy way for my students to make one at home.
ReplyDeleteThanks Tess, I'll give the ketchup packets a try.
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