twistintornado - tape, so that they stay together and...

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University of Florida Chemistry Outreach Program Twistin’ Tornado Estimated Time: 20 mins. + 15 mins. clean-up Topics: Weather Introduction: When huge air masses move across the ground, they start to roll like a carpet. If one rolling air mass runs into another rising warm one, the rolling mass gets tipped on end and the rising warm air rushes up through the whirling middle causing a tornado. Can you make a tornado in a bottle? Objective: The lab is designed to observe the properties of a tornado. Materials: -Two plastic soda bottles (per student/group) -Duct tape -Food coloring Safety: - Remind students there is NO eating or drinking in the lab. Procedure: 1. Fill one of the bottles three-quarters full with water. Add a few drops of food coloring. 2. Pull off a strip of duct tape about 10 cm long and place it on the edge of a table, where you can reach it. 3. With a dry towel, make sure the neck of the bottle is very dry. 4. Put the empty bottle on top of the full one, neck to neck, and tape them together with your short strip of
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Unformatted text preview: tape, so that they stay together and theyre straight. 5. Now, wrap them with a long length of duct tape. The more neatly you wrap, the better it will work. 6. Turn your tornado twister upside down, and give it a swirl. Try it again, without giving it a twist. Discussion: Gravity pulls the water down into the empty bottle. But the empty one is not really empty. It is full of air. When the water swirls through the necks of the bottles, an open space forms in the middle, it is a whirlpool. The air in the lower bottle can flow up through the open center of the whirlpool into the upper bottle. The spinning water holds a steady shape. Without the whirlpool to let the air go by, the water burbles its way through. The flow is not smooth and its often much slower than the whirlpools flow. Source: This lab is a modified version of a similar activity from NyeLabs.com...
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