))))) use Archimedes method, it uses water
and is 2000 year proofed right. say real volume and then say virtual, imaginable, magical volume is soandso. virtual may be different meaning, that is the problem here. 70, 80,90,105 kg man,
windsurf ladies are smaller, the virtual volume is very different to them. all here say, say real volume!, and then say your opinion of virutal volume.