namichie at gmail.com
Fri Jun 9 19:38:41 EDT 2017
My memory of high vacuum work is that you need to pump for 4 hours
at 300C to remove the water monolayer from glass.
On top of the that water monolayer is another water monolayer that comes off more easily,
and on top of that another………..
> On 9 Jun 2017, at 10:57 AM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> On 6/8/2017 5:08 PM, Bob kb8tq wrote:
>> In this case hydrogen + oxygen (like from oxidized metal) goes to H20. You very much do
>> not want water running around inside your crystal holder… Helium is inert.
> Exactly right Bob. The 10811 guys used to go nuts
> about keeping water out of their vacuum system.
> There were certain temperatures known as "water
> points" at which some water was released.
> The retained water was in spite of the temperature
> already being above 100 degrees C (boiling).
> It has something to do with monolayers of
> water molecules not boiling away.
> Rick N6RK
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