1. How to Make a Tornado in a bottle
Materials:
2 x 2L circular soda bottles
water
1 roll of transparent tape
Optional:
Glitter
Method:
1. Take the caps off the 2 bottles.
2. Take the labels off the 2 bottles.
3. Fill one bottle 2/3 with tap water.
(Optional: put 2 teaspoons of glitter into the bottle containing the water.)
4. Ask someone to hold the bottle without the water on top of the other
bottle until the top of the bottles line up.
5. Put the transparent tape around the tops of the bottles so the water
won’t come out.
6. Grab the bottom bottle and use your other hand to grab the middle of
the bottles.
7. Quickly turn the bottlesupside down and then spin it in two rounds.
8. Observe the top bottle to see a vortex.
Discussion:
How do tornadoes happen in the real world?
Tornadoes happen when winds move in opposite direction. The wind
wants to get past from each other so the start spinning horizontally.
Then, warm humid air moves upward to make thunderclouds and the
warm humid air carries the air into the thunderclouds and tilts it into a
vertical tube. Then, the downdraft pulls the air down as the cool air
descends and it pulls the column of air down to the ground. And when the
air touches the ground, a tornado in made. As the wind spins, it speeds
up and people use the Fujita scale to measure its strength. F0 means
light, F4 means devastating and F5 means incredible. A tornado usually
last for 10 minutes and strong ones can last up to 25 minutes.