4A40.20 - Liquid Nitrogen - Banana and Mercury Hammer
See also 4A40.20 in Chemistry and Physics of Everyday Experience
Arrange ahead of time to get liquid nitrogen from either Biochem Stores . Typically it takes about 4 liters for each classroom demonstration. Freeze a banana and you can drive nails with it. The fibrous nature of the banana keeps it from breaking apart easily.
Directions for the Mercury Hammer can be found in the files or the hardcopy 4A40.20 entry.
The temperature of liquid nitrogen should be a -196oC or approximately 77o K.
- Hk-7, 8: Freier and Anderson, A Demonstration Handbook for Physics.
- H-078: "Objects in Liquid Nitrogen", DICK and RAE Physics Demo Notebook.
- Mike Walker, "Cold, Hard Facts", Popular Science, June 2009, p. 74.
- Gordon McComb, Lasers, Ray Guns, & Light Cannons - Projects from the Wizard's Workbench, pp. 28.
Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.