Final answer:
The derived unit typically used to express the density of liquids is grams per cubic centimeter (g/cm³), which is also equivalent to grams per milliliter (g/mL).
Step-by-step explanation:
The derived unit usually used to express the density of liquids is grams per cubic centimeter (g/cm³). Though the official SI unit of density is kilograms per cubic meter (kg/m³), it is often more convenient to use g/cm³ in a laboratory setting, especially since the density of water at 4°C is exactly 1 g/cm³. This value is easy to remember and provides a useful reference point for comparing the densities of other substances. Since 1 cubic centimeter is also equal to 1 milliliter, density can also be expressed as grams per milliliter (g/mL), which is equivalent to g/cm³. While densities of gases are typically given in grams per liter (g/L), for solids and liquids, g/cm³ is commonly used and readily understood.