College of Liberal Arts & Sciences
2B40.45 - Gas Law - 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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