another air has mass idea

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From: Lori Lambertson (loril@exploratorium.edu)
Date: Thu Sep 27 2001 - 10:33:53 PDT 

Message-Id: <l03110700b7d913295780@[192.174.3.134]>
Date: Thu, 27 Sep 2001 10:33:53 -0700
From: Lori Lambertson <loril@exploratorium.edu>
Subject: another air has mass idea

Hello Pinhole Friends,
This is from Geoff Ruth, who had trouble posting to pinhole:

Something that's even more impressive than the balloon demo is to
inflate a bike tire, starting with it inflated. Because the pressure
inside the tire is so much greater than the P inside a balloon, the
corresponding mass increase is much more noticeable.

-Geoff

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