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Questions about the mineral oil submerged mobo

In the cool video below - a clever fellow submerses a motherboard and other components in gallons of mineral oil in a fish tank kind of display.  It works, it's cool.  It made me think of a few questions..  

Why would he need a fan in this setup?  Seems that much mineral oil would keep everything cool enough.  How is it that he can stick his finger into the mineral oil without electrocution??

http://www.wimp.com/hugeidea/
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amigan_99
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amigan_99
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Scott CSenior Systems EnginerCommented:
Mineral oil does not conduct electricity.  That is why the computer works, doesn't short out and cause electrical shocks.

The reason he has the fan is that heat is generated and it eventually has to go somewhere.  Even though it's in oil it will eventually overheat as the heat builds up...abeit more slowly than in the air.

And the fan will cause the oil to circulate around thus dispersing the heat rather than it "pooling" around the components.

And of course the bubbles from the air stone brings in cool air from the outside thus dispersing more of the heat that builds up in the oil.  And it looks cool as all get out.
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amigan_99Network EngineerAuthor Commented:
Thanks for the insight!
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Scott CSenior Systems EnginerCommented:
You are most welcome.  I've half a mind to take some of our old hardware and give this a try myself.
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