This demonstration shows the Meissner effect. A superconductor in a petri dish is cooled using liquid nitrogen. Once chilled, a small magnet may be suspended above the superconductor showing how the properties of the superconductor changed with temperature.
* Equipment seen in the video may vary from equipment used in ND Demonstrations. See information and images below for ND equipment and setup.
Setup:
Place the petri dish on the demo table. Put the superconducting disk in the center of the dish.
Wearing gloves and safety goggles, pour the liquid nitrogen over the superconductor.
Allow the system to sit until the top of the superconducting disk is no longer covered by liquid nitrogen.
Using the tweezers carefully suspend the magnet over the superconductor. If the magnet will not float, the system is not cold enough.
This may also be done with the magnet sitting on the superconductor and the liquid nitrogen poured over the system. Once the superconductor is cold enough, the magnet will raise up off the disk.
Notes:
Be careful when handling liquid nitrogen. Be sure to use gloves and goggles.
Courses Used In:
Coming Soon
Discussion and Polling Questions:
Coming Soon
Equipment Needed:
Petri Dish
Superconducting Dish
Small Magnet
Plastic Tweezers
Goggles
Gloves
Liquid Nitrogen
Webcam
Stand