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I would expect the principle would be the same as that applied when vacuum impregnating insulating varnish into electric motor windings. Putting the stator immersed in liquid varnish under vacuum...

How I know is easy. By trade I'm an industrial electrician with additional certs for working with explosion rated equiptment in hazardous environments (petro-chemical, gas, dust etc).
I also did a...

Hydrogen goes boom anywhere from 5% to 95% concentration in air, there's no need to confine yourself to the stoiciometric ratio if you're just trying to remove your eyebrows.