On Thu, 27 Oct 2005 23:00:54 -0500, "Dale Hallmark"
wrote:


"Phil DeMayo" wrote in message
news:1130471413.841fef97e10692372107a14b4d4048ec@ teranews...
On Thu, 27 Oct 2005 19:41:53 -0700, "Bob Flaminio"
wrote:

Bob and Dee wrote:
Can anyone tell me how to tell the difference between Zinc and
Copper pennies?

The only way to tell is by weight. The copper weighs about 3.11 grams
and the zinc weighs about 2.5 grams. You need a very sensitive scale
to measure these.

Not at all -- you can do it with a pencil and a popsicle stick.

They also make different sounds when dropped on a hard surface.


Zinc will melt at 787 degrees F but copper melts at 1981 degrees F

Hmmm--I wonder what would happen if you heated a Zlincoln above the
melting point of the zinc, but below the melting point of the copper
coating.

take care,
Scott