2B40.45 - Gas Law - Weight of Air Globe

See paragraph one in the procedure section
Code Number:
Demo Title:
Gas Law - Weight of Air Globe
Moles and Periodic Chart Fundamentals
Area of Study:
Heat & Fluids
Weight of Air Globe.

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.

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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.