Use the table to answer Exercises 7–9. The information in the table can be used to determine the density of each object. Density describes how tightly the particles in an object are packed together. You can find density by dividing an object’s mass by its volume. 7. Estimate the density of aluminum. 8. Is the density of gold greater than the density of mercury? Explain. 9. The density of gold is about how many times greater than the density of aluminum?