Final answer:
The volume of water in a large-scale reservoir is often measured in cubic meters (m³).
Step-by-step explanation:
Volume is the measure of the amount of space occupied by an object. The standard unit of volume is a cubic meter (m³). However, for more practical use, a liter (L) is commonly used. A liter is equal to 1000 cm³ or 1 dm³.
Therefore, when measuring the volume of water in a large-scale reservoir, it is often measured in cubic meters (m³).