# The volume is 1.5 cm^3 and the mass is 7.5 grams. What is the density?

Density is just the number of particles per unit volume. The more stuff in a given volume, the more dense it is. The mass is directly proportional to the number of particles, so the units can be ${\text{g/cm}}^{3}$.
color(blue)(D) = "7.5 g"/("1.5 cm"^3) = color(blue)("5.0 g/cm"^3)
What is this density in ${\text{kg/dm}}^{3}$?