In a cold gauge, when the coils heat up, they a) vaporize any liquid on
the coil and b) heat up the air around the coil, allowing that air to
pick up more moisture. The heat of the coil causes a convective current
of air to travel around the inside of the gauge; the relatively warm,
moist air comes into contact with a cool surface, and condensation forms
(I would think condensation would form on all parts of the gauge that
are cold, but you only notice the condensation on the glass).
Eventually, the entire gauge warms up, and the condensation is
re-evaporated into the air and the fogged glass clears.
Sound plausible?
John P. New
--
London, Ontario, Canada
'67 BJ8
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On Thu, 2006-01-05 at 08:33, Warthodson@aol.com wrote:
> In a message dated 1/4/2006 1:03:00 PM Central Standard Time,
> Alan@nfahc.co.uk writes:
> The electro-magnetic coils must run warm (or even hot) causing
> the condensation.
> How does heat cause condensation?
> Gary Hodson
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