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Tornado in a Jar! Make a Mini Twister You Can Hold

2026-10-16 · Watch on YouTube

Summary

Swirl a jar of water and watch a tiny tornado appear right in your hands! Find out why spinning water opens a funnel in the middle, and how the same science swirls down bathtub drains, twirls dust devils across fields, and spins a giant storm on Jupiter.

Transcript

0:00A Tornado You Hold

What if I told you that you could hold a tornado in your hand? A real spinning funnel, swirling round and round, right inside a jar! No wind, no storm, no wild weather. Just water, a jar, and you. Today, you are going to make a mini twister of your very own. And here's the wow part: the same science that spins your little jar tornado also spins the water down your bathtub drain, and even the giant whirlwinds that dance across deserts. Pretty amazing, right? Scientists call this kind of spinning shape a vortex. Vortex! Say it out loud. It sounds like a superhero name, right? Vortex, the Spinning Wonder! Well, get ready, because you're about to become a vortex maker. So grab your thinking cap, because first we need to gather some super simple supplies. And I bet most of them are already hiding in your kitchen right now.

0:48Your Tornado Toolkit

Here's your tornado toolkit. First, a clear plastic jar or bottle with a lid that screws on tight. Plastic is best, because it won't break if it slips out of slippery hands. Second, water. Lots of it! Fill your jar almost all the way to the top, leaving just a tiny bit of air. Third, one small drop of dish soap. Just one! Too much and you'll get a jar full of bubbles instead of a tornado. Fourth, and this is the fun part, a pinch of glitter or a few tiny beads. They're like little passengers riding your tornado, so you can see exactly where the water goes. And one last thing: a grown-up helper. Ask them to check that the lid is on super tight. Trust me, a jar tornado is awesome. A kitchen-floor flood? Not so awesome. Here's a wow fact for you: water is about eight hundred times heavier than the same amount of air. That's why water makes such a great tornado to watch. It moves slowly enough for your eyes to keep up! Ready to make it spin? Let's do this.

1:43Spin Your Twister

Okay, tornado maker, here's the secret move. Hold your jar by the lid with one hand, and put your other hand under the bottom. Now swirl it in small, quick circles, like you're stirring a giant invisible pot. Round and round and round. Keep going for about five seconds. Now stop. Hold the jar still and look inside. Whoa! Do you see it? A tiny twisting funnel, right in the middle of the water! The glitter is zooming around it like race cars on a track. If you don't see it the first time, don't worry. Even scientists try things lots of times. Try swirling a little faster, or in smaller circles. Every try teaches you something new. Wow fact: your little tornado can keep spinning for several seconds after you stop moving the jar. You stopped, but the water didn't! So why does the water keep going, and why does a hole open up right in the middle? Let's zoom in and find out.

2:33Water Keeps Moving

Here's the first big secret. Moving things like to keep moving. Scientists call this inertia. Imagine a ball rolling across a smooth floor. Once it's rolling, it keeps rolling until something slows it down. Water works the same way. When you swirl the jar, you give every bit of water a push, and it starts going around in a big circle. When you stop the jar, nothing is pushing the water to stop right away, so it just keeps swirling. Eventually, the water rubs against the sides of the jar, and that rubbing, called friction, slowly takes away its speed. Little by little, the spin gets slower until the water is calm again. Wow fact: out in space, where there's almost nothing to rub against, a spinning thing can keep spinning for billions of years! Our planet Earth has been spinning for that long. But inertia is only half of the story. The other half explains the funnel, and it's all about going in circles.

3:25Why Water Pushes Out

Have you ever been on a spinning playground ride? Or sat in a car going around a big curve? You feel like you're being pushed toward the outside, right? That happens because your body wants to keep going in a straight line, but the ride keeps turning you in a circle. So you slide toward the outside edge. Water feels the exact same thing! Each tiny bit of spinning water wants to zoom off in a straight line. But the wall of the jar is in the way. So the water squeezes outward, presses against the wall, and actually climbs up the sides a little. Now think about it. If water is piling up at the edges, where does it come from? From the middle! The middle gets lower and lower, and that dip is your funnel. Wow fact: this same outward push is how a salad spinner dries lettuce! The spinning flings the water off the leaves and out to the sides. But wait until you see the shape this makes up close.

4:14Shape of a Funnel

Let's take a closer look at the shape you made. At the outside edge, the water is high, pressed up against the wall. In the very middle, the water dips down into a point. Put those together and you get a funnel, wide at the top and skinny at the bottom, like an ice cream cone standing on its tip. Now watch the glitter. It doesn't just go around. Some of it slowly drifts toward the middle and spirals downward, tracing a path like a corkscrew. Those sparkly travelers are drawing a map of your vortex! And that single drop of dish soap? It helps the water slide along more easily and leaves tiny bubbles that make the funnel easier to spot. Little helper, big job. Wow fact: the middle of a vortex has lower pressure than the outside, which means less push. That's why floating things get drawn toward the center. But here's a puzzle. Why does the water near the center spin even faster than the water at the edge? To solve it, we're heading to the ice rink.

5:07Spinning Ice Skaters

Picture an ice skater gliding onto the ice. The skater starts to spin slowly, with arms stretched out wide, like airplane wings. Then the skater pulls their arms in close to their body, and zoom! They spin super fast, like a whirling top. They didn't push off the ice again. They just pulled their arms in. That's a real rule of nature: spinning things speed up when they pull in closer to the center. Your jar tornado does the very same thing! As water drifts toward the middle, it speeds up, just like the skater's arms. That's why the center of your twister whirls the fastest and digs the deepest dip. Wow fact: top skaters can spin around about six times every single second! Try counting that fast. I can't! And guess what? This exact same trick happens every time someone pulls the plug in the bathtub.

5:54Bathtub Drain Swirls

Next time you take a bath, ask a grown-up if you can watch the water go down the drain. Look closely as it empties. Often, a little swirl appears, with a dip in the middle, and sometimes a tiny tube of air poking down into the drain. That's a vortex! As the water rushes toward the drain, it moves closer to the center, so it spins faster and faster, just like the skater. The spinning water gets pushed outward, and a funnel opens in the middle. Sound familiar? It's your jar tornado, sitting in the tub! Now, here's a myth buster. Some people say drains always swirl one way in the top half of the world and the other way in the bottom half. For a bathtub or sink, that's not true! The way the water was already moving, and the shape of the tub, matter much more. You can test it yourself: give the water a gentle stir one way, then try the other way next time. Wow fact: the Earth's spin really does steer giant storms, the ones big enough to see from space. And that brings us to nature's biggest vortexes of all.

6:51Whirlwinds in Nature

Air can make vortexes too! On hot, sunny days in deserts and fields, the ground warms up the air right above it. That warm air rises, starts to spin, and whoosh, you get a dust devil: a twirling column of dust dancing across the ground. Most are small and gentle, and they fade away in a minute or two. Over warm lakes and seas, a spinning column can form above the water too. It's called a waterspout, and it looks like a giant straw reaching from a cloud down to the water. Real tornadoes are the biggest spinning air funnels on land. They are very powerful, so weather scientists study them from far away with special radar and cameras, and they send out warnings to help keep everyone safe. Your jar tornado is the perfect way to study a twister up close, the safe and splashy way. Wow fact: on the planet Jupiter, there's a giant spinning storm called the Great Red Spot, and it's bigger than our whole planet Earth! People have been watching it swirl for more than one hundred and fifty years. So many vortexes, everywhere! Now, are you ready to become a vortex scientist and run your own experiments?

7:56Be a Vortex Scientist

Real scientists ask questions and then test them. So let's do that! Experiment one: try swirling your jar faster, then slower. Does a faster swirl make a deeper funnel? Make a guess first, then test it. Experiment two: try a tall, skinny bottle and a short, wide jar. Which one makes the best tornado? Experiment three: swap the glitter for tiny beads, or add a drop of food coloring with a grown-up's help. Which passengers show the swirl the best? Experiment four: swirl clockwise, the way a clock's hands move, then counterclockwise, the other way. Does your tornado care which way it spins? Keep a little notebook and draw what you see each time. Scientists call that recording your data, and it makes you a real researcher! Wow fact: some scientists use big spinning tanks of water in their labs to study how real storms and ocean currents swirl. Your jar is a tiny version of their science lab! Now let's spin back through everything we discovered today.

8:51Recap and Challenge

Wow, what a spin! Let's recap. You made a tornado in a jar with water, one drop of soap, and a pinch of glitter. You learned that moving water keeps moving because of inertia. And you found out that spinning water pushes outward against the walls, leaving a funnel-shaped dip in the middle. You discovered that water speeds up near the center, just like an ice skater pulling in their arms. And you saw that the same vortex science swirls down bathtub drains, twirls dust devils across fields, and even spins a giant storm on Jupiter! Here's your challenge: make your jar tornado and show it to someone in your family. Then ask them, do you know why there's a hole in the middle? You'll be the one with the answer! And remember, keep that lid on tight and wipe up any splashes. Keep spinning, keep wondering, and keep asking why. You're a vortex maker now, and the whole swirling world is waiting for you to explore it. See you next time, scientist!

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Series: science (English)