Re: Pinhole Digest #1411 - 01/17/04

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From: Al Rahbar (drrahbar@yahoo.com)
Date: Sun Jan 18 2004 - 00:12:09 PST 

Message-ID: <20040118081209.70284.qmail@web40905.mail.yahoo.com>
Date: Sun, 18 Jan 2004 00:12:09 -0800 (PST)
From: Al Rahbar <drrahbar@yahoo.com>
Subject: Re: Pinhole Digest #1411 - 01/17/04

Hi Treena:

The answer to your question is simple. It has something to do with the pressure difference inside and outside of the glass before and after burning the matches. The matches consume oxygen to burn. Lack of oxygen/less air means less pressure inside the glass (<1atm) than the pressure outside of the glass (=1atm). The high pressure outside (=1atm) will cause the water level inside (which has a pressure < 1atm) to rise.

Here are some demonstrations,

1) Crunching a soda can

2) Dropping a hard boiled egg into a bottle.

Good luck,

 Ali Rahbar. email: drrahbar@yahoo.com

 
 
Subject: rising water level science
From: "Treena Joi"
Date: Fri, 16 Jan 2004 19:51:35 -0800

I have a student who wishes to prove that when burning matches suspended
on water in a closed glass (glass set on top as they burn), the rising
watre level is due to the consumption of oxygen -- my understanding is
that another gas is produced, effectively replacing any consumed O2, and
that the rise in the water comes from a temperature difference -- First,
is this understanding correct? Second, how do I channel this students
energy? It's not enough to say, it is such and such gas replacing the O2
... can anyone think of a way to demonstrate that it is indeed due to
gases occupying less space when cooled

Treena Joiful

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