This experiment is to be used to determine the era of which the composition and thus the density of the penny changed, and what the other metal besides copper has made up the composition since 1962. First, ten pennies from three different time periods (1995-1999, 2000-2004, 2005-present) were gathered. All ten pennies from a specific time were weighed together on an analytical balance. Then, a fifty mL graduated cylinder was filled with twenty mL of water, which was recorded as the initial volume. The ten pennies were dropped into the graduated cylinder one at a time so that the liquid didn’t splash. The final volume was recorded once all the pennies were in the water. Finally, the volume of the penny was found be subtracting the initial
