1. The problem asks: What is used to measure volume? 2. Volume is the amount of space that a substance or object occupies. 3. The common units for volume include liters (L), milliliters (mL), cubic meters ($m^3$), and cubic centimeters ($cm^3$). 4. To measure volume, we use tools such as graduated cylinders, measuring cups, pipettes, and volumetric flasks. 5. For regular-shaped objects, volume can be calculated using formulas (e.g., volume of a cube is $V = s^3$ where $s$ is the side length). 6. For liquids, graduated cylinders or measuring cups are used to directly measure volume. 7. For irregular objects, volume can be measured by water displacement method. Final answer: Volume is measured using graduated cylinders, measuring cups, pipettes, volumetric flasks, or by calculation using formulas depending on the object.