If the mass of a material is 45 grams and the volume of the material is 15 cm^3, what would the density of the material be?

First convert to the si units

SI unit for Mass is kilogram and for volume is m^3

45/1000 equals to 0.045kg

15/100 equals to 0.15m^3

Density is equal to mass times volume

D equals to 0.045*0.15

D equals to 0.00675kg/m^3