First, jaydee and iggiebee, take it to PMs if you are so inclined.
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Originally posted by Since87
I believe that what Dave was trying to convey, was that given two rods of equal length and mass, one made of copper and one of aluminum, the aluminum rod would conduct more heat for a given temperature differential between the ends of the rods, than the copper rod. Is this not correct?]
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Yeah, it seemed like he was trying to simplify things, but didn't word it quite well enough.
Well, i'll do the calculations for the two metals.
Let's assume a rod of 1kg mass, 1m long, with a permanent temperature differential of 100°C across it.
For aluminum, its diameter will be 1.085cm, for copper, 0.597 cm.
(a few calculations later)
the amount of heat transferred is:
Copper= 431.20 Joules
Aluminum= 758.09 Joules
(oops, proved my last post wrong. guess the values i was thinking of weren't for thermal conductivity after all.)
Aluminum transfers just over 75% more energy than copper does, given a rod of matching mass and length - not to be confused with size/volume. Were these rods the same length and diameter, copper would have transferred 89% more energy than aluminum.
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What weight/mass distinction were you referring to?
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Again, oops. In my first read through the thread I thought I remembered someone making that distinction...