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Re: Cloud chambers



Forum for Physics Educators <PHYS-L@list1.ucc.nau.edu> on Thursday,
September 23, 2004 at 6:59 PM -0600 wrote:
To make such a cloud chamber work, it may be
necessary to rub the top of the plastic with a wool cloth to
create a static electric charge.
That is only necessary to create a clearing field to keep the 'clouds'
from filling the chamber and obscuring further tracks. It is not
necessary to get it started. Most of the time, the cloud trails are
'heavy' enough that they are gravitationally cleared and the static field
is not necessary.

In my experience, methanol (dry) works much better than isopropyl.

Pete Lohstreter "Happy is he who gets to know
The Hockaday School the reasons for things. "
11600 Welch Rd Virgil (70-19 BCE) Roman poet.
Dallas, TX 75229

214-360-6389

plohstreter@mail.hockaday.org



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