Either litres or cubic metres.
Irregular solid volume is still measured in cm3 etcTo Find the Volume of an irregular object you can,Measure out a proportional amount of water to the object you are finding the volume ofPut the object in the container of waterSee how much the water has risen byYou now have the volume!!(The difference between the new and old volumes of water is the volume
The unit for volume is the same, whether the shape is regular or irregular.
Lsquared
Mass per unit volume is the object's "Density".
You would use Volume.
Density = mass of an object divided by the volume of that object. Its unit is mass per unit volume.
Volume is measured in any cubic unit, such as cubic meter, cubic decimeter (also known as liter) or cubic centimeter (also known as milliliter).
A cubic metre.
It is cubic cm.
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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.