Hot answers tagged vacuum
5
Has anyone ever constructed an ultra-high vacuum system with half-assed, or no cleaning of parts?
Haven't we all done that at some point?
How'd it turn out?
Badly!
Water and hydrogen are easy to bake off the internal surfaces, but get any hydrocarbons, skin grease, silicone, etc on it and you'll be baking for days.
1
What causes these constants to have the values they do is simply our choice of a system of units.
When you have a unitless constant, it makes sense to ask why it has the value it does. For example, two of the lines in the visible spectrum of hydrogen have wavelengths in the exact integer proportion of 28/25. When this was first discovered, it made sense to ...
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