Science Behind - WHAT’S A PENNY MADE OF?

Do you know what that penny in your pocket is made of? In the early days, a penny was made of 100% pure copper. Over time, its composition was changed slightly to 95% copper, 5 % zinc and perhaps trace amounts of tin. At some point a penny was 88% copper and 12% nickel. However after 1982, the composition of the penny was changed significantly to 97.5% zinc and 2.5% copper. These copper-plated pennies are still being minted—and they are probably the pennies in your pocket today.