The cent’s composition was changed in 1982 because the value of the copper in the coin started to rise above one cent. Some 1982 pennies used the 97.5% zinc composition, while others used the 95% copper composition.
Are the densities of pennies made before and after 1982 different?
Water retained by the pennies may have increased the volume measurements. The density of pennies made before 1982 was measured to be 8.79 g/mL, while the density of pennies made after 1982 was measured at 6.90 g/mL. This confirms our hypothesis stating that the pre-1982 pennies would be more dense.
What would be the average density of the 1960s pennies?
7.15 g/cc
Pennies are 97.6 percent zinc and 2.4 percent copper, giving them a density of 7.15 g/cc – the lowest of any US penny.
Why is a penny worth more than one cent?
Why the Copper Penny Is Worth More Than One Cent 1 The Copper and Zinc in a Penny. A pre-1982 penny consists of 95% copper and 5% zinc. 2 Calculating the Penny’s Meltdown Price. 3 Buying Pennies. 4 A Warning About Legality. 5 Collecting and Storing Pennies. …
How much does a penny weigh when newly minted?
The United States penny, or one-cent, weighs different amounts depending on the year the penny was made. Pennies used to be made of copper and switched to being made from zinc in the year 1982. So how much does a penny weigh? The answer: A copper penny weighs 3.11 grams when newly minted. The copper penny is made up of 95% copper and 5% zinc.
Why does a penny have a different mass than a penny?
Different metals have different densities. A penny containing more of a certain metal than another penny will have a different mass, because its density is different. If the average mass of your control group (those pennies minted before 1970) is different from that of any of the variable groups,…
