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Explain how mercury can be used to make an electrical switch that does not produce a spark. Please help!!! I am stumped!
And got the following answer:
Using mercury as the metal that breaks contact to make a switch does not prevent a spark. It prevents accumulation of mechanical damage to the surface of the metal breaking contact, because it is liquid. The vapor produced by the flash condenses back to liquid mercury and the blast pit flows back to a smooth surface. But there is still a spark. And if you try to break too much voltage, the spark will not extinguish and the mercury will boil and the vapor pressure will break the container holding the mercury and inert atmosphere. -- Regards, John Popelish