The teabag's wet, so what's trapping the air isn't so much the teabag itself as the water filling the holes in the teabag. (Air can enter and exit a dry teabag with ease.) In order for the air to escape it would have to exert more force via its pressure and buoyancy than is exerted by the water's surface tension, I think.
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branchandroot
no subject
Date: 2008-01-02 04:27 pm (UTC)