Balloon Barometer


content.gif (1503 bytes)
 Code Number :   2B35.45?

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA.

The University of Iowa Disclaimers:  University of Iowa Disclaimer All Rights Reserved..

Condition :   Excellent 
Principle :   Air Pressure
Area of Study :  Heat & Fluids  
Equipment :   2-liter bottle with the bottom cut out, 9-12" balloon.

Procedure :   Insert the balloon into the bottle before you blow it up and poke the neck of the balloon through the neck of the bottle.  Stretch the balloon as you blow it up in the bottle and blow it up until 2 or 3" extend out the end of the bottle.  Changing altitude by several thousand feet will cause the balloon volume to expand or contract by a measurable quantity.
conbot.gif (53 bytes)


   References

John C. Salzsieder, "Atmospheric Pressure Indicator," TPT, Vol. 33, # 4, p. 224, (1995).

Chu E-qing,  "A Demonstration to Show the Variation of Atmospheric Pressure with Height."  TPT, Vol. 24, # 6, p.  354, (September 1986).

 



Mail Questions and Comments to:  Dale Stille