# Hydrodynamic Levitation!

On a stream of water you can levitate light balls of all sizes and even disks and cylinders. The mechanism is not the Bernoulli effect…
Want to make this at home:

My friend Blake from InnoVinci emailed me with a cool idea for a video and footage of levitating balls in water streams. Initially it was tough to explain the physics of what was going on. The standard Bernoulli effect relies on the object being completely immersed in the upward-flowing fluid. But in this case the water seems to form a single stream around the object and it’s deflected away and down from the stream. By Newton’s third law, the force on the water by the ball is equal and opposite to the force of the water back on the ball, pushing it up into the stream. There is a stable equilibrium position because if the ball moves into the stream, it “cuts off” the water going over the ball so it drifts out. If it drifts out too far, then lots of water passes over the ball, pushing it back into the stream.

Special thanks to Patreon Supporters:
Tony Fadell, Donal Botkin, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen

Support Veritasium on Patreon: http://ve42.co/patreon

Filmed by Raquel Nuno
Slow motion by Hollywood Special Ops http://hollywoodspecialops.com

# Teacher Demo – Water Quality Demonstration

This demonstration shows some differences between potable (drinkable) water and non-potable (non-drinkable) water.  Variations in temperature, turbidity and pH level also determine the types of microorganisms that can thrive in each water sample.  Continue reading

# Wrapper Worm – Sick Science! #175

You can have a ton of science fun with a straw. You can make it into a blow gun, using the properties of air, or it can double as a pipette when your lab has run out. But did you know you can perform some awesome hands-on science with the straw’s wrapper, too? It’s true. With the Wrapper Worm, we’ll reveal how to turn an ordinary straw wrapper into a growing worm!

Find out why this works here: http://www.stevespanglerscience.com/l…

Want more experiments like this? Check out http://www.stevespanglerscience.com/p…

# Water on the Moon?

For a long time we thought the Moon was completely dry, but it turns out there are actually three sources of lunar water. Continue reading

# The Toilet-Education Connection: What’s a toilet worth in Kenya?

Sanitation is a critical, yet often overlooked fundamental human right. This documentary, first in a series, broadly describes the worth of the sanitation-education connection in one area of Kenya, by defining its challenges and presenting solutions. Continue reading

# Teacher Demo/Student Activity: Bending Water

In this demo, a polyethylene rod is charged by rubbing with wool. The charged rod is then used to bend a stream of water flowing from a tap.

Different substances have different attractions for electrons. When two materials are rubbed together, electrons will leave the substance with the lower attractive force and enter the substance with the higher attractive force. This will result in each substance having a slight positive or negative charge. Water is made up of polar molecules, each containing a negatively charged oxygen end and a positively charged hydrogen end. When a charged rod of material is brought near a thin stream of water, the water will be attracted to the charged rod and the stream of water will bend towards the rod.

# The Truth About Toilet Swirl – Southern Hemisphere

SYNCHRONIZE WITH DESTIN’S VIDEO: http://bit.ly/NorthernSwirl
Both videos on one page (for desktop): http://bit.ly/ToiletSwirl
Subscribe to Smarter Every Day: http://bit.ly/SubscribeSED
Click to tweet: http://bit.ly/ToiletSwirlTWT

Some notes:
We each repeated the experiment 3 times, and got the same results every time. For those of you who might be skeptical, great! A right circular prismatic kiddie pool is only \$10 and you can do the experiment for yourself at your latitude. There’s really no reason you shouldn’t do it for yourself.

# Wilt Thou Water Me?

Children can identify that water exists in 3 states within our natural environment. Plants can use this water, in either liquid or vapour form, to survive.