Get smart curated videos delivered to your inbox.   SUBSCRIBE
The Kid Should See This

The Meissner Effect: How to levitate a neodymium magnet

Watch more with these video collections:

A neodymium magnet cube sits on a surface of yttrium barium copper oxide—YBa2Cu3O7, nicknamed YBCO—inside the bottom of a styrofoam cup. A small amount of liquid nitrogen is poured slowly over the YBCO. As it cools, the disc becomes a superconductor… and the cube levitates. Behold the Meissner Effect, as demonstrated in this video from the Harvard Natural Sciences Lecture Demonstrations YouTube channel.

meissner effect harvard demonstration video
What causes the cube to hover as if by magic? From Scientific American:

Quantum magnetic levitation boils down to something called the Meissner effect, which only occurs when a material is cold enough to behave like a superconductor. At normal temperatures, magnetic fields can pass through the material normally. Once it is cold enough to exhibit superconductivity, however, those magnetic fields get expelled. Any magnetic fields that were passing through must instead move around it. When a magnet is placed above a superconductor at critical temperature, the superconductor pushes away its field by acting like a magnet with the same pole causing the magnet to repel, that is, “float”—no magical sleight of hand required.

Read more about Harvard’s DIY demo and Dartmouth’s safety precautions for handling liquid nitrogen.

Then watch more demonstration videos, more videos about magnetic fields and more levitation videos, including this spooky holiday version: Levitating pumpkins! Halloween superconductor science.

This Webby award-winning video collection exists to help teachers, librarians, and families spark kid wonder and curiosity. TKSST features smarter, more meaningful content than what's usually served up by YouTube's algorithms, and amplifies the creators who make that content.

Curated, kid-friendly, independently-published. Support this mission by becoming a sustaining member today.

🌈 Watch these videos next...

Why do ice cubes crack in drinks?

Rion Nakaya

What happens to balloon animals in liquid nitrogen?

Rion Nakaya

To the Scientists of the Future: Materials science with EUPHRATES

Rion Nakaya

Thermal expansion sphere and ring demonstrations

Rion Nakaya

The surprising interactions between copper and neodymium magnets

Rion Nakaya

The Story of Nitrogen

Rion Nakaya

Sculpting in Solid Mercury using Liquid Nitrogen

Rion Nakaya

Rotating Saddle, a physics demonstration

Rion Nakaya

Quantum Levitation: A mind-blowing demonstration and explanation

Rion Nakaya