To measure the density of an irregular object, first determine its mass using a balance. Then, find its volume by water displacement: submerge the object in a graduated cylinder filled with water and record the change in water level. The volume of the water displaced equals the volume of the object. Finally, calculate the density using the formula ( \text{Density} = \frac{\text{Mass}}{\text{Volume}} ).
A simple diagram would show a graduated cylinder with water, the initial water level, the object submerged, and the new water level to illustrate the water displacement method.
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