Bottles Balanced on a beam with an air compressor
Air Globe
Bottle with a Fizz Keeper

 

Code Number: 2B40.45

Demo Title: Gas Law - Weight of Air Globe

Condition: Excellent

Principle: Moles and Periodic Chart Fundamentals

Area of Study: Fluids

Equipment: 

Two - 2 liter clear bottles hung balanced on a crossarm, Air Pig pressurized to at least 50 lbs., Air hose with tire inflator, Weight of Air Globe, hand inflator that fits on a 2 liter bottle.

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.

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