Demonstrations

Gas Law - Weight of Air Globe

Code Number :	2B40.45
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 :	Moles and Periodic Chart Fundamentals
Area of Study :	Heat and Fluids
Equipment :	Weight of Air Globe.
Procedure :	The two bottles should balance when placed on the ends of the balance beam. Place about 45 lbs. of air into the air pig. Then, blow up one of the bottles to 45 lbs. The balance beam will show that the bottle you put the extra air into is now much heavier than the other bottle. If done as directed above, the bottle that you put the extra air into should have 4 times the air mass as the other bottle. You can also weigh the bottles directly on a digital balance and show the additional mass of air. The weight of air globe has a constant volume. After evacuation the globe is weighed. The globe then may be filled with air or some pure gas and re-weighed. Different weights should be observed for each specific gas.

References

Figuring Physics, TPT, Vol. 45, # 1, Jan. 2007, p. 49.

Mark Talmage Graham, "Investigating Gases' Masses in Impecunious Classes," TPT, Vol. 40, # 3, p. 144, March 2002.

Jolene Houser, Doug Johnson, and Peter Siegel, "Getting Pumped Up on the Ideal Gas Law," TPT, Vol. 40, # 7, p. 396, Oct 2002.

"Figuring Physics", TPT, Vol. 39, # 7, Oct. 2001, p. 410.

Loren M. Winters, "A Photogate Flash Trigger and a Demonstration of Inertia", TPT, Vol. 30, # 7, Oct. 1992, p. 411.

Michael D. Edmiston, "Agitation Solution" TPT, Vol. 30, # 6, p. 325, September 1992.

Charles Parsons, " More Agitation than Solution,", TPT, Vol. 30, # 6, p. 325, Sept. 1992.

Robert G. Buschauer, "An Alternative Way to Measure Air Density", TPT, Vol. 29, # 2, Feb. 1991, p. 115.

Se-yuen Mak and Zhu E-Qing, "A Quick Method to Measure the Density of Air," TPT, Vol. 28, # 6, p. 406, September 1990.

Howard Brody, "An Experiment to Measure the Density of Air," TPT, Vol. 27, # 1, p. 46, January 1989.

"Figuring Physics", TPT, Vol. 27, # 5, May 1989, p. 410.

David M. Pope, "The Last Round Up: Eggs' Mass vs. Refrigerator's Air Mass", TPT, Vol. 27, # 6, Sept. 1989, p. 581.

Albert W. Burgstahler, Tom Wandless, and Clark E. Bricker. "The Relative Lifting Power of Hydrogen and Helium." TPT, Vol. 25, # 7, p. 434, October 1987.

Herbert E. Steingass, "Density of Air: Boiling Point of Water", TPT, Vol. 19, # 5, May 1981, p. 334.

Maureen M. Julian, "Composition of Air: Further Calculations", TPT, Vol. 19, # 6, Sept. 1981, p. 362.

Thomas B. Greenslade, Jr., "Vacuum Pump (Photo)", AJP, Vol. 70, # 12, Dec. 2002, p. 1193.

F-115: "Bag of Gas," DICK and RAE Physics Demo Notebook.

M- 22a: Wallace A. Hilton, "Density of Air," Physics Demonstration Experiments.

Julien Clinton Sprott, Physics Demonstrations, "2.17 Weight of Air", p. 111, ISBN 0-299-21580-6.

Robert Ehrlich, "Weighing a Balloon When Filled and Empty," Why Toast Lands Jelly-Side Down, p. 111-112.

Janice VanCleave, "Tip," Earth Science for Every Kid - 101 Easy Experiments That Really Work, p. 122-123.

"Does Gas Have Mass?", The Caliper, Vol. 21, # 2, Fall 2004, p. 7, Vernier Software and Technology.

Mail Questions and Comments to: Dale Stille