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Building on Vickie's suggestion. I recall that thin plastic soda bottlescut
can handle about 50 psi.
If one drills a hole in a cap, and screws in a threaded tire valve
(available at many autoparts stores for go-faster alloy wheels)
Then one could compare the weight of the bottle at ambient
pressure, and one inflated to 15 psi, even 30 psi, using a digital
postal balance.
This would give a reasonably plausible result, quite cheaply.
Brian Whatcott
p.s. Care obviously needed with inflation)
At 10:58 AM 2/4/2005, you wrote:
Actually, the two balloons on a meter stick doesn't even show that, b=
ecause of the phenomenon of the buoyant force. =20
One "right" way to weigh air (in principle) is to take a vacuum bell =
jar, weigh it on a sensitive balance, pump it out, seal it off, and w=