This document discusses how to determine the density of an object by measuring its mass and volume. It explains that density is equal to mass divided by volume. It describes how to measure the mass of an object using a triple beam balance and how to measure the volume of a regularly shaped object using measurements or an irregularly shaped object using water displacement in a graduated cylinder. It also provides background on the density of water being 1 g/mL and how this property can be used to determine if an object will sink or float based on whether its density is greater than or less than that of water.