A cubic centimetre or litre.
Mass per unit volume is the object's "Density".
Density = mass of an object divided by the volume of that object. Its unit is mass per unit volume.
If, by 'metric system', you mean the 'SI system', then there is no base unit for volume. The unit for volume is called a 'derived unit', and it is the cubic metre (m3).
the base unit of volume in the mtric system is litres and cm ^3
The meter is the metric base unit for volume, and the cubic meter is the derived unit.
There is no object with a volume of 2000 mm because the "mm" is a unit of length NOT volume.
It is the ratio of an object's weight to its volume. Alternatively it can be said, it is the weight of the object per unit of volume.
Liter because it's the base unit of volume
A unit of volume for a 3 dimensional object such as cubic inches, metres, litres etc. A unit of area for a 2 dimensional object such as square inches, metres etc
Base units need not have ANY volume. A second is the base unit for measuring time and it has no volume!
The density of an object is its mass per unit of volume and is determined by dividing its mass by its volume.
Liters