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Density What is Density? • Density is how closely packed together molecules are in a substance. • Formula: Density = mass volume •D=m V What Unit will we use for density? • Any mass unit over any volume unit. • Some common examples: g/cm3 kg/cm3 g/m3 3 mg/mL g/L cg/mm If a block has a mass of 24 g and a volume of 15.6 cm3, what is it’s density? Divide the mass by the volume. D = 24 g 3 15.6 cm 3 D = 1.53846 g/cm D = 1.5 g/cm3 Let’s find the density of your textbook. • Your book has a mass of 1400 g, a length of 20.68 cm, a width of 3.95 cm, and a height of 26.10 cm. We can also find the mass or volume of a substance using density. • The density of iron is 7.86 g/cm3. If the mass of a piece of iron is 47 g, what is the volume of the iron?