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Density is a physical property of matter. Density of a substance can be determined by measuring mass and volume. These measurements are used in the formula D= m/v to determine the density of the substance. Density values are useful when trying to identify an unknown substance. Units for density are g/mL and g/cm^3. Units of g/mL are used for the density of liquids. Units of g/cm^3 are used for the density of solilds. Density describwes how much matter is found in a specific volume of a substance. So g/mL really means _______ measured in grams per _______ measured in millimeters and g/cm^3 really means ________ measured in grams per _________ measured in cubic centimeters. Water has a density of  1.0 g/mL. Substances like most woods have density values that are less than water and so they float when placed in water. Substances like potato cubes have density values that are greater than water sp they sink when placed in water.