Volume will always have the word 'cubic' in the definition
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One way to remember volume units is to remember the acronym "GQT", which stands for Gallon, Quart, Pint. This order represents the hierarchy of common volume units in the US customary system.
The volume of 20 cubic units represents the amount of space a three-dimensional object occupies. It means that a hypothetical cube with side lengths of 20 units would have a volume of 20 cubic units.
The units for volume are the units for length cubed. For example, the base unit is the meter, and the cubic meter is the basic unit of volume.
Cubic units measure volume.
The volume of the substance can be calculated using the formula: volume = mass/density. In this case, the volume would be 80/40 = 2 cubic units.
Scientists typically measure volume using units such as liters (L) or milliliters (mL) for liquids and cubic meters (m^3) or cubic centimeters (cm^3) for solids. These units provide a standardized way to express the amount of space occupied by a substance.