Neat trick, maybe I'll try it one of these days. Just
remember, HCl + Zn ---> hydrogen gas, a good way to
turn your hobby area into a miniature Hindenburg, not
to mention splattering acid all around. Be careful,
wear your safety glasses!
--- "Timothy A. Seufert" <[EMAIL PROTECTED]> wrote:
> At 2:13 PM -0700 9/10/99, David Cretney wrote:
>
> >I am a chemist in training. The tables in front of
> me show that aluminum
> >has about 2.5X's the heat capacity of copper. This
> means that it will
> >require about 2.5X's as much energy to raise its
> temperature. My
> >understanding is that the aluminum will hold more
> heat and is possibly the
> >better conducter of heat.
>
> Copper is by far a better conductor of heat,
> actually. Sometimes a copper
> plate is used in heatsinking to act as a "heat
> spreader" to distribute heat
> coming from a small area (such as a very small chip)
> to a larger area on an
> aluminum heatsink, as otherwise the device would
> just heat a small spot of
> the poorly conducting aluminum.
>
> Keep in mind that, at least in the US, pennies are
> not really copper. Not
> sure when the transition happened (decades ago?),
> but U.S. pennies are now
> made out of zinc with a thin copper cladding. This
> style of penny was
> introduced for a very sensible reason: the cost of
> producing a solid copper
> penny rose above 1 cent, so they reduced the
> materials cost. Pennies may
> not be as ideal a heatsink material as you think.
>
> (In my high school chemistry class we did a cool
> "experiment" where we took
> a shiny new penny, scraped an edge to expose some of
> the zinc, and then
> dropped it in a weak HCl solution. HCl reacts with
> zinc, but not copper.
> In a day or so the HCl had completely eaten the zinc
> out of the penny,
> leaving a copper shell.
>
> Tim Seufert
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