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Penny Ram sinks....

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Originally posted by: FishTankX
But are you gonna go to the bank and get a roll of pennies and pick out the ones that are before 1984? 😕

Also, even a little bit of impurities can destroy the thermal conductivity of metal, from my memory. Anyone care to correct me on this?
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FishTankX... the impurities thing is right on the money. PURE OFHC (oxygen-free, high conductivity) copper has a thermal conductivity of 400 W/(m K). But copper oxides have VERY low thermal conductivity.... and even copper mixed with trace amounts of other metals (especially highly oxidizing ones) can drop the thermal conductivity to 150~200 W/(m K). At that point, you're not doing much better than aluminum--which is cheap and more easily found.
 
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