Popping Joints

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From: The Lahrs (johnjan@lahr.org)
Date: Wed Nov 29 2000 - 07:25:58 PST 

Message-Id: <4.2.0.58.20001129082235.00b8a800@netmail.home.com>
Date: Wed, 29 Nov 2000 08:25:58 -0700
From: The Lahrs <johnjan@lahr.org>
Subject: Popping Joints

An interesting project would be fabricating an artificial joint that would
pop!

John
>4. When my joints pop, is the sound from a liquid turning into a gas?
I've always heard this.
When you pull on the fluid in a joint you reduce the pressure so that the
joint fluid temperature remains the same but the boiling temperature drops.
The fluid then produces bubbles.
When you release the pull the temperature remains the same and the boiling
point becomes higher than the temperature. The bubbles suddenly vanish and
the walls of the bubbles crash in on each other creating a sound.

* John C. and Jan H. Lahr
*JohnJan@lahr.org
* 1925 Foothills Road
* Golden, Colorado 80401-1718
* (303) 215-9913
* http://lahr.org/john-jan

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