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Density Density is the measure of how much mass is contained in a given volume * density is made up of two measurements mass and volume, so the density of an object is expressed as a relationship between two units Density = mass volume D=m/v 1. grams/cubic centimeter 2. grams/milliliter g/cm3 g/mL (units solids) (units liquids) Remember the methods are different for finding the volumes of Regular Objects, Irregular Objects, and Liquids The density of an object does not change as its size changes. Example: The density of pure gold is 19.3 g/cm3 no matter the size of the piece of pure gold Once you know an object’s density you can then determine whether or not it will float in a given liquid. Example: An object will FLOAT if it is LESS dense than the liquid An object will SINK if it is MORE dense than the liquid Water has a known density of 1.0g/cm3 or 1.0g/mL remember: 1cm3 = 1mL , so these two densities are EQUAL Let’s Practice: 1. Mass 50g Volume 10mL 2. Mass 20g Volume 40cm3 Density = ___________ Density = ___________ 3. Density 8.0 g/cm3 Volume 10cm3 4. Density 4.0 g/mL Mass 2.0g Mass= _____________ Volume = ___________