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Is it possible to seal a perfectly smooth surface?

I think I've figured this out (through some discussion with a helpful physicist). Yes, of course it's possible to seal a perfectly smooth surface. The purpose of roughness in o-ring sealing is twofold …
spencer wilson's user avatar
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Is it possible to seal a perfectly smooth surface?

I've heard that a surface roughness needs to be within a defined range, but in theory, is it possible to seal a perfectly smooth surface? E.g. with an o-ring, static or dynamic? Intuition tells me tha …
spencer wilson's user avatar