Date: Thu, 14 Sep 2000 12:18:20 -0700 (PDT)

Author: William Beaty

Subject: hint about humidty & electrostatics


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---------- Forwarded message ----------
Date: Thu, 14 Sep 2000 05:52:00 -0700
From: Anders Thulin

Hey, Im trying to teach Swedish industrial people about risks from static
discharges when handling flammable liquids and solids. Some parts of the
year the humidity in Scandinavia is high and there is a problem to give
lessons then. One simple way to make the VdG more powerful is to place the
equiment on a table with a heating foil under a carpet (to protect it and
make the heat more even). After standing over night I obtain typically a
temp of 35C on the surface when the temp in the room is about 20C. The
humidity (measured with two electronic humiditygauges) can be as much as
20% lower when heated some 15 ! There should not be too strong draft in
the room. I also use this to explain to my pupils to be careful when
handling liquids that has been heated - even if only slightly. In paint
production it is common to rais teh temp 20-30 by the mecanical energy
from disolvers etc.