Poul-Henning Kamp wrote:
In message <4a30457e.9060...@erols.com>, Chuck Harris writes:
And evaporates and leaks. But yes, I've used water for quick jobs.
I just don't know what to say to that! Even a child can put a
case of bottled water in a box, and not have it evaporate or leak.
I would venture that said case of bottled water will still be full
up when the child graduates from college, and has kids of his own.
Unless UPS or DHL decides to leave your package stranded on a loading
dock in -20°C for a couple of days.
In the lab I *might* use water, for shipping I never would.
I thought we were talking about stabilizing the temperature environment
around frequency/time standards? I recall the discussion talking of big
hunks of aluminum, copper, cast-iron engine blocks bought at scrap yards,
and other such unshippable things.
The nice thing about using water as a thermal ballast is you don't
have to ship it specially. It is available everywhere humans go.
If you are worried about it freezing, a 50-50 mix with ethylene
glycol will protect it from freezing down to -40C, or so, though
if we are talking about temperatures like that, it is unlikely that
your precision clock is going to work very well down there.
-Chuck
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