he discovered that volume of object immersed in water =volume of liquid displaced
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Percent of an objects mass is expressed in terms of its weight. Percent of an objects volume is expressed in terms of its size.
This is actually how people approximate real volume of obscured 3D objects.
Archemedes
Yes there is. 2D objects are flat objects that only have a length, width, and area. 3D objects include a height and volume.
Partition (or divide) the irregular object into summation of regular objects and then calculate the volume.