7.1347 g/cm³ is the density of a new penny.
Mathematically; density = mass/volume
In this case, the mass of the coin is 2.49 g, and the volume is 0.349 cm³. Thus:
Density of coin = 2.49/0.349 = 7.1347 g/cm³
The density of copper is 8.96 g/cm³ at room temperature.
Hence, the penny is not made of copper.
Density is the mass of a material substance per unit volume.
d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density. For instance, whereas Earth has a density of 5.51 grams per cubic centimeter, water has a density of 1 grams per cubic centimeter. Another way to state density is in kilograms per cubic meter (in metre-kilogram-second or SI units).
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