What is the density of a substance that has a mass of 55 grams and a volume of 85 cm?
Density= mass/volume (One of my old teachers had us remember
this as Dogs Make Vomit, gross).
So, plugging the numbers into the formula:
Density= 55 g/85 cm3 = .65 g/cm3
Note, that I rounded the answer up and, for future reference, that 1 cm3 is equal to 1 ml, another common unit used for density.