As you will learn later in this course, some liquids do not mix with each other, oil and water being an example. When such nonmixing liquids are combined, they form separate layers, with the densest substance at the bottom. Suppose the nonmixing liquids gasoline, liquid mercury, and liquid water are added to an empty graduated cylinder. Using the data in Table 2.4, draw the graduated cylinder and show the positions of the three liquids.

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Table 2.4 Densities of Some Common Substances* Substance Density (g/mL) Substance Gold (solid) 19.3 Butter (solid) Mercury (liquid) 13.6 Gasoline (liquid) Lead (solid) 11.4 Oxygen (gas) Water (liquid) Air (gas) Water (solid ice at 0 °C) Helium (gas) 0.997 0.917 Density (g/mL) 0.9 0.7 0.001 43 0.001 30 0.000 18