One More Pressure Meter

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From: SFPhysics@aol.com
Date: Sat Nov 23 2002 - 11:37:55 PST 

From: SFPhysics@aol.com
Message-ID: <1e.2e5e034.2b113313@aol.com>
Date: Sat, 23 Nov 2002 14:37:55 EST
Subject: One More Pressure Meter

Opps! I forgot one of the most easy ways of measuring lower pressures in a
bell jar. Use a ground glass medical syringe. Lubricate the plunger with a
small amount of vacuum oil so it will move freely. Leave a small measured
amount of air in the bottom and seal the sryinge opening with a bit of
modeling clay. Stand it vertical so the plunger is up using a wood block.
(A Boyle's Law demonstrator from the Physics lab will work just fine.) If
you have measured the weight of the plunger and computed the area of the
plunger then you may compute the equilibrium pressure as the plunger rises
while air is removed from the bell jar. This is just a variation of the
Boyle's Law demo.

Best wishes to everyone,

Al Sefl
Using osmosis to brine the turkey... umm - ummm good!

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