MadSci Network: Chemistry

Subject: Density of a penny

Date: Tue Dec 2 08:37:50 2008
Posted by Brian
Grade level: 7-9 School: Harris Road Middle School
City: Concord State/Province: NC Country: USA
Area of science: Chemistry
ID: 1228232270.Ch

The density of U.S. pennies minted after 1982 is listed as 6.94 g/cm3.  These 
pennies contain 97.6% Zinc and 2.4% Copper.  The density of Zinc is 7.13 g/cm3 
and Copper is 8.92 g/cm3.  How can the density of a penny be less than either 
of the two metals used to make it?

Re: Density of a penny

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