Speaking as a resident alien, most of the ones I know are OK in small doses. ;)
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs at electrooptical dot net http://electrooptical.net
They'll pretty well stay put. Diffusion is an exponential thing, so where it's happening at say 800K, it's down by exp(800K/300K) = 14.4 times at room temperature. Wait, that's not so impressive.
References.... ah, diffusion follows the Arrhenius equation, which puts it in terms of exp(Eo/k_B*T), so the ratio between temperatures is exp(-(Eo/k_B*T) * (1/T1 - 1/T2)). That requires knowing what the activation energy is, though. Can't find it.
Tim
-- Deep Friar: a very philos>> >>
Didn't you mean "Variac"
;-)
--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock)
There are some recorded instances of "tin plague" in organ pipes in unusually cold weather.
--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock)
planets
How small of a dose, and is it contagious? ;-)
-- Greed is the root of all eBay.
I think they predated even 'lint' by quite a bit. ::))
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WangoTango
snipped-for-privacy@qq.vv.net=20
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sitting?
They will stay put pretty well. Solid solubility at normal terrestrial=20 surface temperatures is mighty low. Micron per hour diffusion requires=20 about 2000K. And the mobility does follow the e^kt Arrhenious=20 relationship.
You could ask Jim to settle it. ;-)
-- Greed is the root of all eBay.
Lets say that I found too many defective tantalums in broken equipment. When it comes to capacitors: electrolytics come first, tantalums next. Besides that, a lot of rain forrest is cut to get the tantalum.
-- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------
John Larkin schrieb:
Hello,
you forgot the bad effect of temperature cycles at low temperatures between -60 and -10 °C. Low and constant temperatures would be better.
Bye
Michael A. Terrell schrieb:
Hello,
there is another problem with tin at low temperatures, it may transform into another modification, the solid metal will be a powder then. In german we call it Zinnpest or tin-plague. It has destroyed some organ pipes in churches during a very cold winter. It may be avoided by using a proper alloy of tin.
Bye
Jim Thompson schrieb:
Hello,
not only the pipes and bellows, but also the keyboards and the valves cotrolling the air to the pipes.
Bye
John Larkin schrieb:
Hello,
rubber often does not stand for many decades, it loses flexiblity and goes hard and brittle developing cracks.
Bye
I have also heard of it being a problem with the buttons of early 1900s=20 Russian military uniforms in very cold climates.
and the organist....
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