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Which is more dense a penny from before 1972 or a penny from after 1972?
Wiki User
∙ 13y ago
1972 has no significance in terms of changes in penny densities. The US Mint did not change the composition of its penny between 1909 to 1982, so any pennies from within this time period would have the same density. Pennies from this time period all contained the same proportions of metals (95% copper, 5% zinc.)
Coins from post-switch 1982 to present day are minted of 97.5% zinc and 2.5% copper.
Copper's density is ~8.9g/cm3 while zinc's density is ~7.1g/cm3. Considering the relative compositions of each version of the penny, the post-1982 penny would be the less dense penny, and the pre-1982 penny would be the more dense of the two.
Wiki User
∙ 13y ago
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